Determining the phase structure of Quantum Chromodynamics (QCD) and its Equation of State (EoS) at densities and temperatures realised inside neutron stars and their mergers is a long-standing open problem.
I will present a framework for the EoS of dense and hot QCD that describes the deconfinement phase transition between a dense baryonic and quark matter phase via the holographic V-QCD...
I discuss how objects with topological charge 1/N can arise in CP(N-1) models in 1+1 dimensions, and in SU(N) gauge theories, without dynamical quarks, in 3+1 dimensions. The ansatz involves multivalued functions: a Z(N) vortex in the former, and a Z(N) monopole in the latter. Unlike classical instantons, such a quantum instanton has a fixed size on the order of the scale for confinement. ...
This study explores the utility of a kernel in complex Langevin simulations of quantum real-time dynamics on the Schwinger-Keldysh contour. We give several examples where we use a systematic scheme to find kernels that restore correct convergence of complex Langevin. The schemes combine prior information we know about the system and the correctness of convergence of complex Langevin to...
The increasing accuracy in the experimental measurements of several hadronic observables related to weak processes, which in many cases is smaller than $\mathcal{O}(1\%)$, requires the inclusion in theoretical calculations of subleading corrections that were neglected so far. Over the past decade isospin breaking effects due to electromagnetic interactions and to the up-down quark mass...
Finding order parameters for the detection of critical phenomena and self-similar behavior in and out of equilibrium is a challenging endeavour in non-Abelian gauge theories. Tailored to detect topological structures in noisy data and accompanied by stability and limit theorems, persistent homology allows for the construction of sensible and sensitive observables. Based on state-of-the-art...
In order to understand the nature of the XYZ particles, theoretical predictions of the various XYZ decay modes are essential. In this work, we focus on the decays of the heavy quarkonium hybrids in the EFT framework. We start with the weakly coupled potential NRQCD effective theory that describes systems with two heavy quarks and incorporates multipole expansions and use it to develop a...
Description of nuclear matter in the core of neutron stars eludes the main tools of investigation of QCD, such as perturbation theory and the lattice formulation of the theory. Recently, the application of the holographic paradigm (both via top-down and bottom-up models) to this task has led to many encouraging results, both qualitatively and quantitatively. In this talk, I will present our...
I will present some recent state-of-the-art lattice QCD results revealing partonic structures of pion and kaon. These results will include valance parton distribution function of pion, pion distribution amplitude as well as electromagnetic form factor of kaon at large momentum transfers.
Gauge/gravity duality is a great vehicle to guide one's path when strongly coupled. We show that this duality will explain many unusual scaling laws for bipartite entanglement entropy and quark-anti-quark potentials present in the numerical data we obtain from the lattice Yang-Mills theory in three- and four dimensions. We also discuss their dual gravity descriptions.
In this talk I will discuss how mixed 0-form/1-form anomalies arise in the Hilbert space of gauge theories in 4d for arbitrary gauge group. I will show how the anomalies reveal an exact degeneracy of states for an arbitrary torus size. Finally, I will discuss some of the implications of our results for semiclassics, the infinite volume limit, and dualities.
The diabatic approach in QCD [1-3] allows to describe a quarkoniumlike meson in terms of heavy quark-antiquark and open-flavor meson-meson pairs, interacting through a coupled-channel potential inferred from lattice calculations of string breaking [4]. In this talk, we present a systematic analysis of $J^{PC}=1^{++}$ charmoniumlike mesons with energies up to $4.0$ GeV within the diabatic...
We have calculated the axial-vector form factors for the hyperon semileptonic decays $B_i \rightarrow B_f l \bar{\nu}$ in the chiral constituent quark model ($\chi$CQM). The decays considered here are the strangeness changing as well as strangeness conserving semileptonic decays of the hyperons. The conventional dipole form of parametrization has been used to analyse the $Q^2$ dependence of...
We present the most recent results from the FASTSUM collaboration for hadron properties at high temperature from anisotropic lattice QCD. This includes the temperature dependence of the light and charmed meson and baryon spectrum, as well as properties of heavy quarkonia. We also present the status of our next generation gauge ensembles.
I will discuss the recent description of realistic neutron stars using a model derived from holography in [2111.03374,2112.10633]. After a brief review of beta-equilibrated isospin-asymmetric dense holographic baryonic matter within the Sakai-Sugimoto model, I will discuss how the resulting equation of state is used for constructing the full compact star within a single framework with only two...
After examining the mass and pressure decompositions of hadrons in the stress-energy-momentum tensor, it is found that the glue part of the trace anomaly can be identified as originated from the vacuum energy of the glue condensate and gives a CONSTANT restoring pressure which balances that from the traceless part of the Hamiltonian (quark and glue kinetic energies) to confine the hadron, much...
The Belle experiment at the KEKB energy-asymmetric e+-e- collider
accumulated dataset with integrated luminosity of 1/ab, including
Upsilon(nS) on resonances, off-resonances, and Upsilon(5S) scan data. And
the Belle II experiment is a substantial upgrade of the B factory facility,
with much higher instantaneous luminosity and will accumulate 50/ab of
data. Belle II has already accumulated...
The existence and location of the QCD critical point is an object of both experimental and theoretical studies. The comprehensive data collected by the NA61/SHINE during a two-dimensional scan in beam momentum (13A-150A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb) allows for a systematic search for the critical point – a search for a non-monotonic ...
Cold and dense matter can be explored in a systematic way both in the high-density (perturbative QCD) and low-density (Chiral EFT) regime. However, the path connecting them is yet to be discovered. As a result, these descriptions are usually extrapolated into the intermediate density regime and then connected at some transition point. In this work I will present a model that has features of...
One of the primary goals of heavy-ion physics is to understand the transport properties of the quark-gluon-plasma (QGP) which comprises the tiniest constituents, quarks and gluons, that prevailed in the first few microseconds after the Big Bang.
The present most challenging part of the research is pinning down the critical point of the QGP, where the shear viscosity over entropy ratio...
The identification of universal properties from minimally processed data sets is one goal of machine learning techniques applied to statistical physics. Here, we study how the minimum number of variables needed to accurately describe the important features of a data set - the intrinsic dimension (Id) - behaves in the vicinity of phase transitions. We employ state-of-the-art nearest...
In the context of warped five-dimensional models formulated to understand the physics beyond the Standard Model (SM), we will discuss the prediction of a continuum of Kaluza-Klein modes on top of the SM zero modes, with a mass gap. We compute the Green’s functions for gauge bosons and describe how the continuum is reached from a discretized theory. We also study the Green's functions for the...
We report our analysis for the static energy in (2+1+1)-flavor QCD over a wide range of lattice spacings and several quark masses, including the physical quark mass with ensembles of lattice-gauge-field configurations made available by the MILC Collaboration. We obtain results for the static energy out to distances of nearly 1fm, allowing us to perform a simultaneous determination of the...
In this talk I will give an overview on recent results on the spectrum and properties of
conventional mesons and exotic mesons (glueballs and four-quark states) as obtained in
the framework of Dyson-Schwinger and Bethe-Salpeter equations with particular focus on
states with the quantum numbers of a scalar.
I will discuss the spectrum of (quenched) glueballs and compare with results from...
Lattice methods are spectacularly successful in measuring thermodynamic properties of strongly interacting matter described by Quantum Chromodynamics (QCD) at small baryon densities, however the existing lattice techniques cannot be easily extended to large densities due to the infamous "sign problem". In this work we have studied the hadronic phase of QCD using relativistic nuclear mean...
The flow of information in high-energy collisions has been recently investigated by various groups. Entanglement entropy of the proton becoming classical information entropy of pdfs, jet splitting affecting entropy, or the entropy in hadron decays have already been reported in the literature. Here we examine aspects of fragmentation functions in this context, including their entropy as...
We analyze [1] the next to leading order (NLO) graviton-graviton scattering amplitude via the Inverse Amplitude Method (IAM), well known to low-energy QCD practitioners [2]. Like the electroweak chiral lagrangian, successfully used for low-energy QCD, the Einstein-Hilbert (EH) lagrangian is a non-linear and non-renormalizable theory whose most relevant operator is a dimension two one...
The design of optimal test statistics is a key task in frequentist statistics and for a number of scenarios optimal test statistics such as the profile-likelihood ratio are known. By turning this argument around we can find the profile likelihood ratio even in likelihood-free cases, where only samples from a simulator are available, by optimizing a test statistic within those scenarios. We...
The possible existence of hybrid stars is studied using several multi-quark interaction channels. The hadronic phase consists of an EOS with presently accepted nuclear matter properties and the quark model constrained by the vacuum properties of several light mesons. The dependence of several NS properties on the different quark interactions is analyzed. We show that the present constraints...
The existence of the X(3872) resonance extremely close to the D∗0 D0-bar threshold implies that neutral charm mesons have an approximate nonrelativistic conformal symmetry. Systems consisting of these mesons with small kinetic energies produced in a short-distance reaction are unparticles that can be created by an operator with definite scaling dimensions in a nonrelativistic conformal field...
We present predictions for the second- and fourth-order curvature coefficients of the QCD phase transition line using the NNLO HTLpt-resummed thermodynamic potential. We present three cases corresponding to (i) $\mu_s = \mu_l = \mu_B/3$, (ii) $\mu_s=0$, $\mu_l = \mu_B/3,$ and (iii) $S = 0$, $Q/B = 0.4$, $\mu_l = \mu_B/3$. In all three cases, we find excellent agreement with continuum...
We investigated the two scalar glueball
scattering and the possible emergence of a bound state,
that we call glueballonium. The scalar glueball, the lightest particle of the
YM sector of QCD, has a lattice predicted mass of about
$m_{G}\simeq1.7$ GeV. We performed this study in the context of a
widely used dilaton potential, that depends on a single dimensionful parameter $\Lambda_G$....
Strongly-coupled dark sectors offer natural UV-complete extensions to the Standard Model that are challenging to access experimentally if they are only weakly coupled to the Standard Model. In this talk, I will present the possibility to test these dark sectors via gravitational-wave signals from the dark confinement phase transition. Due to the non-perturbative nature of the QCD-like sectors,...
Confinement of 4d gauge theories is usually the strong-coupling problem, and it is a difficult task to understand even its qualitative features. We are trying to develop its semiclassical understanding based on the idea of volume independence or adiabatic continuity. We conjecture that the strong-coupling regime of many 4d gauge theories is continuously connected to the weak-coupling theories...
Collective phenomena have proved to be crucial probes to the transport properties of the quark-gluon plasma (QGP) created in ultrarelativistic heavy-ion collisions. One manifestation of these effects is the anisotropic azimuthal distribution of the particles produced in such collisions, which can be parametrized with two distinct degrees of freedom: the flow amplitudes v_n and the symmetry...
A well known technique to determine the decay amplitudes of non-leptonic B meson processes is QCD factorization. One of the main issues faced by this procedure is the analytical determination of power suppressed terms, for instance of annihilation topologies. In this talk we describe the extraction of the annihilation contributions from data. Our method is based on establishing a set of rules...
In recent years, the BESII and BESIII collaborations have provided a lot of new and accurate data on baryon decays of S-wave charmonium states.
These data indicate about sizable effects associated with power corrections to the well known leading-order approximation.
In my talk I will discuss a description of $J/psi\to B\bar B$ decays within the effective field theory framework (NRQCD &...
In this talk, I will discuss the phase diagram at finite isospin density using
two and three flavor chiral perturbation theory. I will also discuss the quark and pion condensates in the pion-condensed phase at T=0. Moreover, the pion-condensed phase has many interesting properties. At small chemical potentials, the system behaves as a dilute nonrelativistic Bose gas with an effective s-wave...
In our previous work, we have been using Lattice results and Polyakov Loop model to explore the non-perturbative dark deconfinement-confinement phase transition and the generation of gravitational-waves in a dark Yang-Mills theory. In this work, We further include fermions with different representations in the dark sector. Employing the Polyakov-Nambu-Jona-Lasinio (PNJL) model, we discover...
The recently observed 4.2-$\sigma$ tension between experimental measurement and theoretical prediction of the muon magnetic moment highlights the need for improved control of uncertainties. On the theoretical side, one of the contributions of interest is the hadronic light-by-light (HLbL). In the dispersive data-driven evaluation of the HLbL, certain short-distance constraints obtained by...
Using the approach based on conformal symmetry we calculate the two-loop coefficient function for the axial-vector contributions to two-photon processes in the MS¯ scheme. This is the last missing element for the complete next-to-next-to-leading order (NNLO) calculation of the pion transition form factor γ*γ→π in perturbative QCD. The corresponding high-statistics measurement is planned by the...
Chiral perturbation theory in the presence of the chiral anomaly predicts a so-called chiral soliton lattice in the presence of a magnetic field and a baryon chemical potential. This phase becomes unstable with respect to charged pion condensation if the magnetic field is further increased. I will point out that this instability bears a striking resemblance to the well-known instability at the...
The peak region in heavy quark production is best described in boosted heavy quark effective theory, where its mass is integrated out. Within this approach the cross section can be factorized into hard, jet and soft func- tions, and large logs associated with the mass can be summed up to all orders.
In this talk we present the computation of the missing pieces to get the bHQET thrust and...
The discrepancy between the fixed-order (FOPT) and contour-improved (CIPT) expansions for tau hadronic spectral function moments has been a subject of intense investigations for more than a decade and constituted a major theoretical uncertainty for strong coupling determinations from hadronic tau decay spectral data. Recently, it has been shown by some of us that a discrepancy between the...
We propose a programme towards the understanding of confinement in QCD by means of the development of a geometrical version of the renormalization group flow for the Standard Model of Particle Physics. This is based on a stochastic version of the Ricci flow, which encodes both changes of topology and topological braiding. The proposed formalism enables the rescaling of fixed topologies through...
Recent years have brought a breakthrough for calculations of partonic distributions on a Euclidean lattice. In this talk, I will discuss our progress in extracting generalized parton distributions (GPDs) from the quasi-distribution approach. I will present both the leading-twist GPDs and our exploratory studies of selected twist-3 cases.
Ample numerical evidence from lattice calculations shows a strong connection between the confining properties of gauge theories at finite temperature and the localisation properties of the low-lying Dirac eigenmodes. In this talk I review recent progress on this topic, including results for QCD at imaginary chemical potential ${\mu}_I/T = \pi$ at temperatures above the Roberge-Weiss transition...
[Reality of the Crosssover Scenarios]
Because the ab-initio EOSs from the $\chi$EFT and the pQCD are both soft, it is unlikely to have a 1st-order phase transition to quark matter that would make the EOS even softer. These calculations as well as observational data and discussions of quark-hadron continuity / quarkyonic matter support the scenario of smooth and continuous realization of...
Heavy quarkonium production of high transverse momentum ($p_T$) in hadronic collisions can be pursued in the QCD factorization formalism with heavy quarkonium fragmentation functions (FFs). The scale evolution of quarkonium FFs enables us to resum logarithmically enhanced corrections $\alpha_s\ln(p_T^2/m^2)$ with heavy quark mass $m$, which is an essential piece to explore the nonperturbative...
The LHCb Collaboration has recently discovered a structure around 6.9 GeV in the double-$J/\psi$ mass distribution, possibly a first fully-charmed tetraquark state $X(6900)$. Based on vector-meson dominance (VMD) such a state should have a significant branching ratio of decaying into two photons ($\gamma \gamma$). We show that the published ATLAS data for the light-by-light scattering may...
We perform lattice QCD simulations in order to calculate nucleon four-point functions, which can be used to extract Mellin moments of double parton distributions (DPDs). In this first study, we consider the first DPD Mellin moment of the unpolarized proton. We employ an $n_f = 2+1$ ensemble with pseudoscalar masses of $m_\pi = 355~\mathrm{MeV}$ and $m_K = 441~\mathrm{MeV}$, the results are...
As a consequence of the theoretical improvements and the wide range of accurate experimental measurements, our understanding of the collective phenomena in heavy-ion collisions has advanced significantly over the past years. The Global Bayesian analysis played a substantial role in this advancement. In this talk, we present a global Bayesian analysis to infer the transport properties of...
The D0-matrix models of string theory have gained much attention in the latter years. I will discuss the physics one can extract from these using lattice-based simulations and the gauge/gravity duality to understand gravitational theories. In particular, I will show how the confinement-to-deconfinement transition corresponds to a topology change of the geometry in the supergravity theory and...
We outline the role that an early deconfinement phase transition from normal nuclear matter to a color superconducting quark-gluon plasma phase plays for the phenomenology of supernova explosions and binary neutron star mergers. To this end we extend the compact star equation of state (EoS) from vanishing to moderately high temperatures that become accessible in the CBM experiment at FAIR. We...
This talk will summarise the experimental status on jet measurements in heavy-ion collisions.
In this talk I will discuss how one can be more differential in
event-shape distributions by measuring the angle defined by the thrust axis
and the beam. As was shown in an earlier publication, the angular
dependence can be parametrised in terms of the well-known angular-averaged
cross section and the so called “angular” distribution. I will show that,
even though for jets initiated by...
In order to understand the puzzle of the free energy of an individual quark in QCD, we explicitly construct ensembles with quark numbers $N_V\neq 0\!\!\mod\! 3$, corresponding to non-zero triality in a finite subvolume $V$ on the lattice. We first illustrate the basic idea in an effective Polyakov-loop theory for the heavy-dense limit of QCD, and then extend the construction to full Lattice...
We analyze the sensitivity of the rare decays $\eta^{(\prime)}\to\pi^{0}\gamma\gamma$ and $\eta^{\prime}\to\eta\gamma\gamma$ to GeV-signatures of a leptophobic $B$ boson.
A controlled theoretical description of the amplitudes, based on vector meson dominance and the linear sigma model, along with the current experimental data, has allowed us place limits on the $B$ boson properties, i.e....
We review the status of tensions in the flavour sector, with particular
attention to semileptonic BBB decays and ∣Vxb∣|V_{xb}|∣Vxb∣
determinations.
Comparing the complex structure of the models of the quark gluon plasma is a useful way to better discern the physics following a heavy ion collision, in particular in the vicinity of a phase transition. In this talk, I will focus on quasinormal modes and the collisions of poles in the complex plane, first by using the chiral phase transition as an illustrative example...
Black hole–neutron star mergers (BHNS) are astrophysical phenomena of great interest because they not only produce gravitational-wave signals but also can have very energetic electromagnetic counterparts in particular in the form of kilonova explosions. The disruption of the neutron star produces the dynamical ejection of some material and the formation of a disk of hot matter around the black...
In the present work, we have studied the T-even subleading twist TMDs in the light-front quark-diquark model. Exclusively, we have studied their relations with the leading twist TMDs in the same model and, the question, how such relations are model (in)dependent, is discussed. We have also compared our results with the other quark models.
In the context of lepton flavor universality violation (LFUV) studies, we study different observables related to the $b\to c\tau \bar{\nu}_\tau$ semileptonic decays. These observables are expected to help in distinguishing between different NP scenarios. Since the $\tau$ lepton is very short-lived, we consider three subsequent $\tau$-decay modes, two hadronic $\pi\nu_\tau$ and $\rho\nu_\tau$...
Beyond the standard model theories involving early universe first order phase transitions can lead to a gravitational wave background that may be measurable with improved detectors. Thermodynamic observables of the transition, such as the latent heat, determined through lattice simulations can be used to predict the expected signatures from a given theory and constrain physical models....
We test a method for computing the static quark-antiquark potential in lattice QCD, which is not based on Wilson loops, but where the trial states are formed by eigenvector components of the covariant lattice Laplace operator. The runtime of this method is significantly smaller than the standard Wilson loop calculation, when computing the static potential not only for on-axis, but also for...
The fundamental constituent of matter at high temperature and density has intrigued physicists for quite some time. Recent results from heavy-ion colliders have enriched the Quantum Chromodynamics (QCD) phase diagram at high temperature and low baryon density. However, the phase at low temperature and finite (mostly intermediate) baryon density remain unexplored. Theoretical QCD calculation...
Local quantum field theory (QFT) provides a framework for establishing the non-perturbative constraints imposed on finite-temperature correlation functions. In this talk I will discuss how the locality of fields has significant implications for the spectral properties of finite-temperature QFTs, in particular that the peak-broadening effects experienced by particle states can be directly...
Charged mesons in the charmonium mass region are a clear indication of the existence of states beyond the naive quark model. After the discovery of the Zc(3900) and Zc(4020) by the BESIII and Belle Collaborations, the Zcs(3985) was discovered by the BESIII Collaboration in the K+ recoil mass spectrum in e+e- collisions.
A natural explanation of the Zc states in the quark model can be...
Many models of composite dark matter feature a first-order confinement transition in the early universe, which would produce a stochastic background of gravitational waves that will be searched for by future gravitational-wave observatories. I will present work in progress using lattice field theory to predict the properties of such first-order transitions. Targeting SU(N) Yang-Mills...
Factorization theorems are known to be extremely powerful tools in high-energy particle physics. Processes like SIDIS, Drell-Yan vector-boson production, Higgs-boson production through gluon fusion and $e^+e^-$ to jets and/or hadrons are just some examples of processes that have been thoroughly investigated by applying rigorous factorization formulae. Furthermore, if in these processes the...
Over the last decades, the theoretical picture of how hadronic jets interact with nuclear matter has been extended to account for the medium’s finite longitudinal length and expansion. However, only recently a first-principle approach has been developed that allows to couple the jet evolution to the medium flow and anisotropic structure in the dilute limit. In this talk, we will show how to...
In this talk, we will discuss the BFKL leading logarithmic resummation, relevant for the Regge limit behavior of QCD scattering amplitudes, in the IR regulated effective action, which satisfies exact functional renormalization group equations. Using this framework we study, in the high-energy limit and at larger transverse distances the transition to a much simpler effective local Reggeon...
Stunning discoveries of the hadronic states that are manifestly different to the conventional meson and baryons have energized the field of spectroscopy in recent years. New exotic states keep appearing thanks to the excellent detector performance of the LHCb experiment and scrupulous data analysis. In this talk, fresh findings on the heavy-flavour pentaquarks and tetraquark families at LHCb...
We study new symmetries of the Cardy-Rabinovici model and their dynamical applications. The Cardy-Rabinovici model is a 4d $U(1)$ gauge theory with electric and magnetic matters, which is a good playground for studying the dynamics of the Yang-Mills theory with $\theta$ angle. In this model, the electromagnetic $SL(2, \mathbb{Z})$ self-duality is not realized in a naive way. Still, the $SL(2,...
We analyze the recent astrophysical constraints in the context of a hadronic equation of state (EoS) in which the baryonic matter is subject to chiral symmetry restoration. We show that with such EoS it is possible to reconcile the modern constraints on the neutron star (NS) mass, radius, and tidal deformability (TD). We find that the softening of the EoS, required by the TD constraint of a...
We study the thermal transitions of dense two colour QCD with two flavours of Wilson fermions at a fixed chemical potential $\mu=443$MeV on a coarse isotropic lattice $a=0.18$fm.
The results on a larger lattice volume ($N_s=24$) are compared with earlier results with the same lattice spacing but a smaller lattice volume ($N_s=16$). Only small finite volume effects are found.
We also...
In view of the usually encountered complexity of the quantum-field-theoretic approach to (two-particle) bound states by means of the homogeneous Bethe‒Salpeter equation, this formalism is frequently subjected to various simplifying approximations. If carried to its extremes, this procedure ultimately yields semirelativistic equations of motion believed to reproduce, at least coarsely, the...
The magnetic fields generated in non-central heavy-ion collisions are among the strongest fields produced in the universe, reaching magnitudes comparable to the scale of strong interactions. Backed by model simulations, the resulting field is expected to be spatially modulated, deviating significantly from the commonly considered uniform profile. In this work, we present the next step to...
In this article [1], we have explored the very important quantity of lepton pair production from a hot and dense QCD medium in presence of an arbitrary magnetic field for simultaneous nonzero values of both the parallel and perpendicular components of momentum. As opposed to the zero magnetic field case (the so-called Born rate) or the lowest Landau level approximated rate, where only the...
Aiming at a self-consistent description of multiquark hadrons (such as tetraquarks, pentaquarks, hexaquarks, etc.) by means of QCD sum rules, we note that the entirety of contributions to two- or three-point correlation functions involving, respectively, two or one multiquark interpolating operators may be straightforwardly disentangled into two disjoint subsets comprising of unambiguously...
We study the production of charm quarks in hot QCD medium utilizing the quasiparticle model (QPM). The deconfined matter is composed of the dynamical quarks and gluons dressed by the effective temperature-dependent masses. The temperature dependence is specified by a running coupling deduced from lattice QCD thermodynamics [1]. For the evolution of the QGP, we employ the results of...
In heavy nuclei, the distribution of neutrons extends out further than the proton distribution forming a so-called “neutron skin”. An accurate experimental determination of the neutron skin thickness of heavy nuclei would provide a unique constraint on the symmetry energy of the nuclear Equation Of State, which strongly depends on poorly constrained three-body forces. Photons have an advantage...
We use complex Langevin simulations to study the QCD phase diagram with two light quark flavours. In this study, we use Wilson fermions with an intermediate pion mass of ~500 MeV. By studying thermodynamic quantities, in particular at lower temperatures, we are able to describe the equation of state.
We present a data-driven analysis of the $\gamma\gamma\to D^+D^-$ and $\gamma\gamma\to D^0\bar{D}^0$ reactions from threshold up to 4.0 GeV in the $D\bar{D}$ invariant mass. For the $S$-wave contribution, we adopt a partial-wave dispersive representation, which is solved using the $N/D$ ansatz. The left-hand cuts are accounted for using the model-independent conformal expansion. The $D$-wave...
The complexity of strong dynamics has triggered many different techniques used depending on the phenomena to be described. Often, they rely on quantization over the plane of constant time in Minkowski space, but there are other possibilities: when quantization is carried out over a light front, the theory is manifestly invariant under the boost transformation along the direction of the...
The ghost propagator in Landau gauge is studied at finite temperature below and above $T_c$ using lattice QCD simulations. For high temperatures, we find that the ghost propagator is enhanced, compared to the confined phase. The results suggest that the ghost propagator can be used to identify the phase transition, similarly to the gluon propagator case.
We explore the consequences of gluonic hot spots in the proton for coherent and incoherent exclusive vector meson production cross sections. For the proton we use the Color Glass Condensate framework in the dilute limit with Gaussian hot spots of fluctuating color charges, which we are able to average over analytically. The cross sections are computed using the lowest order dipole model and...
We report novel lattice QCD results for the three-gluon vertex from quenched lattice-QCD simulations. Using standard Wilson action, we have computed the three gluon vertex beyond the usual kinematic restriction to the symmetric (q² = r² = p²) and soft-gluon (p = 0) cases where it depends on a single momentum scale. We will present a detailed analysis of the asymmetric case (r² = q² ≠ p²) where...
One of the main subjects in current nuclear physics is to reveal rich
phase structure in high baryon density matter: the first-order chiral
transition line with the QCD critical point (CP), the color
superconducting (CSC) phase transition and so on. In the present
contribution, we calculate how the critical fluctuations that develop
around the QCD CP and CSC phase transition, affect...
When colliding heavy ions, like Pb-Pb at the LHC, it is known that long-range
correlations is a collective flow effect of the quark gluon plasma produced in the
collision. Similar effects have also been observed in smaller collision systems such as
p-Pb and pp at the LHC. The origin of these long-range correlations in small systems,
and whether it is the same as in large collision systems,...
We show that the recent ALICE measurement of the hadronic lead-lead cross section implies a small nucleon width, which is inconsistent with all state-of-the-art current global analyses of a wide set of experimental results. This inconsistency has several consequences for global analyses, both at a fundamental level as well as for quantities such as the bulk viscosity. The updated global...
Abstract: Formed in the aftermath of gravitational core-collapse supernova explosions, neutron stars are the most compact observed stars. Their average density exceeds that found inside the heaviest atomic nuclei. According to our current understanding, a neutron star is stratified into distinct layers. The surface is probably covered by a metallic ocean. The solid layers beneath consist of a...
In gauge Higgs theories there is the possibility that there may exist localized excitations of the gauge and Higgs fields surrounding a static charge, and this would lead to excited states of what are usually described as "elementary" particles. This possibility is illustrated by a numerical simulation of the Landau-Ginzburg model of superconductivity, which in turn suggests certain...
I will discuss how to use random quantum circuits to sample the average energy---as well as other observables---of a desired Hamiltonian away from the ground state. Then, using those samples, how to estimate the values of observables at low energy by extrapolation.
From the embedding of the Standard Model Effective Field Theory (SMEFT) in the more general Higgs Effective Field Theory (HEFT), we expose correlations among the coefficients of the latter that, if found to be violated in future data, would lead to the experimental falsification of the SMEFT framework. These are derived from the necessary symmetric point of HEFT and analiticity of the SMEFT...
After a brief historical review of the $\alpha_s$ determination from tau decay and the difficulty of dealing with Duality Violations and the associated asymptotic nature of the OPE which was present in previous analyses, I will describe a new determination of the strong coupling constant based on an improved vector isovector spectral function. This spectral function results from combining...
The FSU2H equation of state model, originally developed to describe cold neutron star matter with hyperonic cores, is extended to finite temperature [1]. Results are presented for a wide range of temperatures and lepton fractions, which cover the conditionsmet in protoneutron star matter, neutron star mergers and supernova explosions. It is found that the temperature effects on...
In the 1960’s Weinberg proposed a way to discriminate between molecular and compact near-threshold bound states in the weak-binding limit. We discuss a generalisation of this criterion which can be employed to characterise the compositeness of bound, virtual and resonance states [1]. In addition, the relevant modifications in the presence of coupled channels, isospin violations and...
We present a composite two-Higgs-doublet model (2HDM) constructed using dilaton effective field theory. This EFT describes the particle spectrum observed in lattice simulations of a near-conformal SU(3) gauge field theory. A second Higgs doublet is naturally accommodated within the EFT. Using information from numerical lattice studies of the SU(3) gauge theory with eight fundamental (Dirac)...
Pinched Borel-Laplace sum rules are applied to ALEPH $\tau$-decay data. For the leading-twist ($D=0$) Adler function a renormalon-motivated extension is used, whose coefficient at $(\alpha_s/\pi)^5$ is taken according to the estimate $d_4=275 \pm 63$. Two terms of dimension $D=6$ are included in the truncated OPE ($D \leq 6$), in order to enable cancellation of the corresponding renormalon...
A simple clustering algorithm based on the euclidean distance among tracks is proposed to find and reconstruct the vertices from where the tracks are emerging. This technique uses the Variational Quantum Eigensolver to find the best combinatorial track to vertex association. The study uses the IBM Quantum Computing simulation framework qiskit to simulate the VQE algorithm. Two vertices have...
The medium that forms in a heavy-ion collision modifies the properties of jets traversing it. These modifications give substantial information about the nature of the medium and, therefore, they are one of the main focuses of the heavy-ion program at LHC. The influence of the medium into highly energetic partons depends on correlators of Wilson lines, which have been studied in perturbation...
We systematically explore real and complex saddle points for the Hubbard model on hexagonal lattice at zero and non-zero chemical potential. As a result of this study, we formulate the saddle point approximation to the path integral, which is essentially the gas of weakly interacting instantons. Since bosonic part of the action is Gaussian, Euclidean field equations for instantons should...
Kaons participate in a number of flavour-changing neutral current decays that are highly suppressed in the Standard Model, which are therefore expected to be sensitive to new physics. Calculating the long-distance contributions to these decay modes is a challenging theoretical problem, and crucial for channels where these effects are dominant. Lattice QCD can provide a first-principles...
We consider kinetic coefficients (thermal conductivity, shear viscosity, momentum transfer rates) of the magnetized neutron star cores within the framework of the Landau Fermi-liquid theory. We restrict ourselves to the case of normal (i.e. non-superfluid) matter and nucleonic composition. The magnetic field is taken to be non-quantizing. The presence of magnetic field leads to the tensor...
The double-charm tetraquark meson $T_{cc}^+(3875)$ can be produced in high-energy proton-proton collisions by the creation of the charm mesons $D^{*+} D^0$ at short distances followed by their binding into $T_{cc}^+$. The $T_{cc}^+$ can also be produced by the creation of $D^{*+} D^{*+}$ at short distances followed by their rescattering into $T_{cc}^+ \pi^+$. A charm-meson triangle...
In my talk, I will present a data-driven coupled-channel analysis of the isoscalar S-wave {$\pi\pi,KK$} scattering using the partial-wave dispersion relations. The central result is the Omnes matrix, which does not have left-hand cuts, and therefore serves as the crucial input needed to study the final state interactions of any hadron processes where the system of two pions (and two kaons)...
Sp(2N) gauge theories with fermonic matter provide an ideal laboratory to build up phenomenological models for physics beyond the standard model based on novel composite dynamics, where the models include composite Higgs along with partial top compositeness and composite dark matter. Without fermions they also supplement SU(N_c) gauge theories in the large N_c limit. In this talk we report on...
In many physical applications, bound states and/or resonances are observed, which raises the question whether these states are elementary or composite. This talk deals with the calculation of the degree of composition (X) of bound or resonant states. We fist review the “classical” formalism to afford this problem for a bound state in nonrelativistic (NR) Quantum Mechanics (QM). Then, we show...
We present results of nucleon structure studies measured in 2+1 flavor QCD with physical light quarks in large spatial extents of about 10 and 5 fm. Our calculations are performed on 2+1 flavor gauge configurations generated by the PACS Collaboration with the stout-smeared $O(a)$ improved Wilson fermions and Iwasaki gauge action at $\beta$=1.82 corresponding to the lattice spacing of 0.085 fm....
Quarkonium production has long been identified as one of the golden signatures of deconfinement in heavy-ion collisions. Recently, the production of J/$\psi$ via (re)generation within the quark-gluon plasma (QGP) or at the phase boundary has been considered a key ingredient for the interpretation of quarkonium measurements in Pb$-$Pb collisions at the Large Hadron Collider (LHC). In addition,...
The recent MODE whitepaper*, proposes an end-to-end differential pipeline for the optimisation of detector designs directly with respect to the end goal of the experiment, rather than intermediate proxy targets. The TomOpt python package is the first concrete endeavour in attempting to realise such a pipeline, and aims to allow the optimisation of detectors for the purpose of muon tomography...
The trace anomaly is a quantity of fundamental interest in field theories, which signals whether the underlying theory is conformal. In the context of neutron stars, we propose the trace anomaly for a new measure of the conformality as an alternative to the speed of sound; here we specifically consider the normalized trace anomaly, $1/3 - P/\varepsilon$, with $P$ and $\varepsilon$ being the...
In this talk, I discuss our recent determination of nonperturbative matrix elements of heavy quark effective theory (HQET), $\bar{\Lambda}$ and $\mu_{\pi}^2$, which universally parametrize nonperturbative effects on various observables in heavy-light meson systems. In this determination, B meson masses and D meson masses are used as inputs. Using our renormalon subtraction method based on...
Nuclear and particle physics research relies on accurate models which generate samples from conditional densities. An implicit quantile network (IQN) is a simple neural network-based machine learning model that has the ability to generate accurate samples from conditional, joint probability density functions. In this talk, we illustrate the capabilities of IQNs for simple generative tasks, as...
It is a fundamental question: what is the origin of the glueball masses? In the pure Yang-Mills theory, there is no mass scale in the classical level, while the breaking of scale invariance is induced by quantum effects. This is regarded as the trace anomaly, which is associated with the non-vanishing trace of the energy-momentum tensor (EMT) operator. In this context, the origin of the...
In this talk, I will review recent progress in lattice calculations of heavy flavor physics. The focus will be on decays of B- and D-mesons and on modern techniques for controlling systematic errors.
I discuss the recent progress in state-of-the art perturbative QCD calculations of the equation of state at large chemical potential. I describe why these calculations that are reliable at asymptotically high densities constrain the equation of state at neutron star densities, and describe how the theoretical calculations can be confronted with multimessenger observations to empirically...
The QCD vacuum has been energetically studied by lattice QCD simulations
with projection methods, such as Abelian projection and center projection.
We propose a new-type projection in the Coulomb gauge, in which gauge configurations are expanded in terms of Faddeev-Popov eigenmodes and only some eigenmodes are kept. With lattice QCD simulations at the quenched level, we apply this...
The AdS/CFT correspondence and its generalization to further examples of gauge/gravity duality provide a very useful approach into solving strongly coupled systems. Here, this will be put at work for the strongly coupled sector of Composite Higgs models. We will work out relation between masses of proposed states in Composite Higgs. As a cross check we compare these results to lattice...
The $\rm{f}_{0}$(980) was observed years ago in $\pi\pi$ scattering experiments. Despite a long history of experimental and theoretical research, the nature of such a short-lived resonance is not understood and there is no consensus on its quark content.
The $\rm{f}_{0}$(980) resonance is measured by ALICE using the $\pi\pi$ decay channel. In this contribution, the multiplicity dependence of...
The Renormalization Group Procedure for Effective Particles (RGPEP) provides the connection between low- and high-energy interactions in QCD through the construction of effective particles [1,2].
The approach reproduces the correct behavior of the coupling constant at high energies (asymptotic freedom) [3] and, at the current level of approximation, the second-order solution of the...
I will discuss the prospects of using femtoscopy in high-energy proton-proton and heavy-ion collisions to learn about the low-energy J/psi-nucleon interaction. Femtoscopy is a technique that makes it possible to obtain spatio-temporal information on particle production sources at the femtometer scale through measurements of two-hadron momentum correlation functions. These correlation functions...
At asymptotically high densities, the neutron-star-matter equation of state (EOS) must approach the EOS of beta-equilibrated QCD matter, as calculated directly within the fundamental QCD theory. This nontrivial constraint at high density, pressure, and chemical potential impacts the inference of the neutron-star-matter EOS at even lower densities. In this talk, I show how this constraint...
Thanks to the recent development of lattice simulation techniques, numerical simulations on an anisotropic system, where the temporal and z directions are compactified while the remaining x and y directions are left infinitely large, have become possible. Such system is understood as an extension of finite-temperature one where only the temporal direction is compactified; namely, the...
The standard model provides for the existence of hybrid states that contain a gluon in addition to the quark and the antiquark. The $\pi_1(1600)$ and the recently observed $\eta_1(1855)$ are examples of such exotic mesons. In the present work, we study the masses and the two-body decays of the members of the lightest hybrid nonet with quantum numbers $1^{-+}$ using a Lagrangian invariant under...
The ability to accurately observe two or more particles within a very small time window has always been a great challenge in modern physics, while holding great potential. It opens the possibility for correlation experiments, as for example the ground-breaking Hanbury Brown-Twiss experiment, that can lead to physical insights. For low-energy electrons, one possibility is to use a micro-channel...
Abstract: The stable hadronic bound states in a hidden new non-Abelian gauge sector provide interesting candidates for strongly-interacting Dark Matter (DM). A particular example are theories in which DM is made up of dark pions which set the DM relic abundance through self-annihilation. One of the simplest realizations is a $Sp(4)$ gauge symmetry with two Dirac fermions. We will discuss its...
Quarks of heavy flavors are useful tool to study quark-gluon plasma created in heavy-ion collisions. Due to their high mass and early production time, heavy quarks experience the entire evolution of the system created in these collisions. Open heavy flavor meson measurements are sensitive to the energy loss in the QGP, while quarkonia are sensitive to the temperature of the QGP as they...
The Casimir effect is a remarkable macroscopic feature of QED, while recent lattice studies have also shown its potential nontrivial consequences in QCD.
In light of having a better understanding of the Casimir effect,
it is advantageous to have a self-contained path integral formulation of the phenomenon.
In this talk I will show how the Casimir effect between two uncharged plates in the...
Compact U(1) gauge theory in 3+1 dimensions possesses the confining phase characterized by a linear raise of the potential between particles with opposite electric charges at sufficiently large inter-particle separation. This phenomenon is closely related to the color confinement in non-Abelian gauge theories such as QCD. In QED, the condensation of Abelian monopoles at strong gauge coupling...
We will report on recent works featuring the parton distribution functions (DFs) of pion-like systems at experimental scales, following an approach which relies on the assumption that there is an effective charge defining an evolution scheme for DFs that is all-orders exact. Within this framework, strict lower and upper bounds on all Mellin moments of the valence-quark DFs are derived....
The four types of maximally nontrivial calorons in SU(2)-QCD have characteristic spatial distribution of Polyakov loops. We describe a classical geometric model of an SU(2)-field with finite, stable solitonic solutions with the same structure as these four types of calorons. These solitons are characterised by two topological quantum numbers which can be compared with electric charge and spin....
The spectrum of QCD is expected to contain, besides bound states of quarks, also bound states of gluons. These glueballs can mix with other states that have the same quantum number. For pure Yang-Mills theory, on the other hand, glueballs are the only physical degrees of freedom which makes the picture much clearer. Using state-of-the-art, parameter-free solutions for the propagators and...
Electromagnetic radiation from the quark-gluon plasma (QGP) is an important observable to be carefully considered in heavy ion collision experiments. At leading order in the electromagnetic coupling and all orders in the strong coupling, the photon and dilepton emission rates can both be determined from the QCD vector channel spectral function. In this talk, I will provide a status update from...
We present a systematic investigation of the possible locations for the special point (SP), a unique feature of hybrid neutron stars in the mass-radius. The study is performed within the two-phase approach where the high-density (quark matter) phase is described by the constant-sound-speed (CSS) equation of state (EoS) and the nuclear matter phase around saturation density is varied from very...
We discuss the status of both conventional and unconventional mesons between 1 and 2 GeV by using hadronic models that describe their masses, strong, and radiative decays. Various conventional quark-antiquark states are considered: some of them, such as the tensor mesons with $J^{PC}=2^{++}$ and mesons with $J^{PC}=3^{--}$, form well established nonets, while other, such as the axial-tensor...
We study the impact of asymmetric fermionic and bosonic dark matter on neutron star properties, including tidal deformability, maximum masses, radii, etc. The conditions at which dark matter particles tend to condensate in the core of the star or create an extended halo are presented. We show that dark matter condensed in a core leads to a decrease of the total gravitational mass and tidal...
The gauge/gravity duality can be used to constrain QCD at intermediate densities and temperatures, where first-principles methods are not available. I will give an overview on recent results from the V-QCD model in this region, including predictions for the phase diagram, deconfinement transition, equation of state, and transport of dense QCD matter. If time permits, I will also discuss...
The High Acceptance DiElectron Spectrometer (HADES) is a versatile detector with particular focus on dielectron measurements in pion, proton, deuteron and (heavy-) ion-induced reactions using proton or nuclei targets in the SIS-18 energy range (1-2 GeV/nucleon). Its excellent particle identification capabilities also allow for the investigation of hadronic observables.
The excess of...
The quark confinement in QCD is achieved by concentration of the chromoelectric field between the quark-antiquark pair into a flux tube, which gives rise to a linear quark-antiquark potential. We study the structure of the flux tube created by a static quark-antiquark pair in the pure gauge SU(3) theory, using lattice Monte-Carlo simulations. We calculate the spatial distribution of all three...
We present a calculation of the heavy quark transport coefficients in a quark-gluon plasma under the presence of a strong external magnetic field, within the Lowest Landau Level (LLL) approximation. In particular, we apply the Hard Thermal Loop (HTL) technique for the resummed effective gluon propagator, generalized for a hot and magnetized medium. Using the derived effective HTL gluon...
More than 20 years ago, Glendenning et al. (1995) proposed the existence of stable white dwarfs with a core of strange quark matter. More recently, by studying radial modes, Alford et al. (2017) concluded that those objects are unstable. We investigate again the stability of these objects by looking at their radial oscillations, and we assume that there is no phase transition between hadronic...
The quark-gluon vertex is one of the basic building blocks of the strong interaction. It is an essential ingredient in functional approaches to nonperturbative quantum chromodynamics (QCD). In the literature, many studies of hadron phenomenology in the Schwinger-Dyson Equation framework have been carried out using the rainbow-ladder truncation, where the quark-gluon vertex is approximated by...
Charge radii of the light nuclei depend on the charge distributions of the proton and the neutron and on the nuclear structure --- the way how nucleons are distributed inside the nucleus. We present a high-accuracy calculation of the nuclear structure for A=2,3,4 nuclei using the latest two- and three-nucleon forces and charge density operators derived up through the fifth order in the chiral...
Experimental searches for neutrinoless double-beta decay aim to determine whether the neutrinos are Dirac or Majorana fermions. Interpreting double-beta half-lives or experimental exclusions in terms of neutrino physics requires knowledge of the nuclear matrix elements, which are currently estimated from various nuclear models and carry a large model uncertainty. This talk will present...
A metastable phase has important physical implications, since it may form vacuum bubbles detectable experimentally. It is well known that, due to spontaneous chiral symmetry breaking, there are two, or more, different QCD vacua. In the chiral limit, in the true vacuum, the pseudoscalar ground states are Goldstone bosons. The chiral invariant vacuum (at the top of the "Mexican hat") is an...
We present results on the in-medium interactions of static quark anti-quark pairs using realistic 2+1 HISQ flavor lattice QCD. Focus is put on the extraction of spectral information from Wilson line correlators in Coulomb gauge using four complementary methods. Our results indicate that on HISQ lattices, the position of the dominant spectral peak associated with the real-part of the interquark...
It is known that 1+1 dimensional real scalar models with a negative mass squared have a soliton solution called the kink. We analyze the distribution of the energy-momentum tensor around the kink by incorporating the quantum correction up to leading order. The Fourier transform of the distribution corresponds to the gravitational form factors. We employ the collective coordinate method which...
Meissner effect for the chromoelectric field is the property of the non-perturbative QCD vacuum postulated to describe color confinement. We follow London's macroscopic theory of the Meissner effect for the magnetic field in superconductors and obtain the dual Meissner effect by fixing the phenomenological color gluon current assumed relevant at strong coupling. Its non-Abelian piece is simply...
There is presently no consensus on how the $\phi$ meson mass and width will change once it is put in a dense environment such as nuclear matter. While many theoretical works exist, connecting them with experimental measurements remains non-trivial task, as the $\phi$ meson in nuclear matter is usually produced in relatively high-energy pA reactions, which are generally non-equilibrium...
We present work [1], in which we extend the publicly available quantumfdtd code. It was originally intended for solving the time-independent three-dimensional Schrödinger equation via finite-difference time-domain (fdtd) method and extracting the ground, first and second excited states. We extend it to (a) include the case of the relativistic Schrödinger equation and (b) add two optimized...
Evidence has emerged recently in large N gauge theories that a `partially-deconfined’ phase can appear between confined and deconfined phases. In this phase, only a subset of colours deconfine. The centre symmetry is spontaneously broken in the partially-deconfined phase, raising the question of whether an order parameter exists that can also distinguish it from the completely-deconfined...
Observation of the scalar glueball, evidence for the tensor glueball, how to search for the pseudoscalar glueball
The scalar glueball is observed in a coupled-channel analysis of the $S$-wave amplitude from BESIII data on radiative $J/\psi$ decays and further data. Ten scalar isoscalar resonances were required to fit the data. Five of them were interpreted as mainly singlet, five as...
Motivated by axion physics, the topological susceptibility at high temperature was calculated by several lattice groups. A comparison with the semi-classical calculation at high temperature is meaningful and the details of the instanton calculation is reviewed. The correct over-all factor in MSbar and high precision parametrization of the temperature dependence is presented.
With the detection of compact binary coalescences and their
electromagnetic counterparts by gravitational-wave detectors, a new
era of multi-messenger astronomy has begun. In this talk, I will
describe how GW170817, our first example in this new class, is being
used to constrain the unknown equation of state of cold supranuclear
matter, and to measure the Hubble constant. I will then...
We report novel lattice QCD results for the position-space gluon propagator from quenched lattice-QCD simulations. Using standard Wilson action, we have computed the gluon propagator in position space with a detailed treatment of discretization errors.
We discuss on the usefulness of the long-distance behavior of gluon propagator for constraining the deep infrared running of the gluon...
We generalize a complex heavy-quark potential model from an isotropic QCD plasma to an anisotropic one by replacing the Debye mass $m_D$ with an anisotropic screening mass depending on the quark pair alignment with respect to the direction of anisotropy.
Such an angle-dependent mass is determined by matching the perturbative contributions in the potential model to the exact result obtained in...
The excitation spectrum of light mesons; which are composed of up, down, and strange quarks; allows us to study QCD at low energies. While the non-strange light-meson spectrum is al- ready mapped out rather well, many predicted strange mesons have not yet been observed experimentally and many potentially observed states still need further confirmation. Hence, the strange-meson spectrum still...
We compute the topological susceptibility of high temperature QCD with 2+1 physical mass quarks using the multicanonical approach and the spectral projector estimate of the topological charge. This approach presents reduced lattice artifacts with respect to the standard gluonic one, and makes it possible to perform a reliable continuum extrapolation.
We study graviton-graviton scattering in partial-wave amplitudes after unitarizing their Born terms. In order to apply S-matrix techniques, based on unitarity and analyticity, we introduce an S-matrix associated to this resummation that is free of infrared divergences. This is achieved by removing the diverging phase factor calculated by Weinberg that multiplies the S matrix, and that stems...
We study the chiral condensate for 2+1 flavor QCD with physical quarks within a non-interacting Hadron Resonance Gas (HRG) model. By including the latest information on the mass variation of the hadrons with respect to the light quark mass, from lattice QCD and chiral perturbation theory, we show that it is possible to quite accurately account for the chiral crossover transition even within a...
The photon propagator for the pure gauge theory is revisited using large lattices. For the confined case we show that it has an associated linearly growing potential, it has a mass gap, that is related to the presence of monopoles, and its spectral function violates positivity. In the deconfined phase, our simulations suggest that a free field theory is recovered in the thermodynamic limit.
Thermal production of sexaquarks are calculated in different Statistical Models.
Sexaquarks are a hypothetical low mass, small radius uuddss dibaryon which has been proposed recently and especially as a candidate for Dark Matter [1,2]. The low mass region below 2 GeV escapes upper limits set
from experiments which have searched for the unstable, higher mass H-dibaryon and did not find...
We present steps towards a consistent synthesis of nuclear observables such as neutron skins, dipole polarizabilities and nuclear masses, and neutron star observables such as radii and tidal deformabilities. Our models are parameterized by five independent variables: the first three parameters in the density expansion of the symmetry energy and two indices for the polytropic equations of state...
We discuss the existence of nets of vortices and monopoles for the SU(3) gauge group in the infrared regime of QCD. By appropriate gauge transformations, magnetic defects like monopoles, vortices and nets in SU(3) gauge group are studied in terms of its SU(2) subgroups. The resulted Lagrangian explicitly shows the above magnetic defects and their interactions. Confinement properties like...
I will review the present status and recent progress on light-meson scattering analyses, by means of dispersive or analytic methods. The recent application of these model independent techniques have settled the controversy about the existence and parameters of long debated resonances. I will thus review the status and recent changes on our knowledge about the resonances observed in these...
