# A Virtual Tribute to Quark Confinement and the Hadron Spectrum 2021

Aug 2 – 6, 2021
online
Europe/Brussels timezone

## NNbar interaction from chiral effective field theory and its application to neutron-antineutron oscillations

Aug 5, 2021, 9:00 AM
25m
online

#### online

Parallel contribution E: QCD and New Physics

### Speaker

Johann Haidenbauer

### Description

Recently, we established an $N\bar N$ potential within chiral
effective field theory [1] which is fitted to up-to-date $N\bar N$
phase shifts and inelasticities provided by a recently published
phase-shift analysis of available $p \bar p$ scattering data [2].
The quality of the description of those phase shifts but also
of $p \bar p$ observables will be discussed.

As an application of this interaction neutron-antineutron oscillations
in the deuteron are considered [3].
In particular, results for the deuteron lifetime will be presented,
evaluated in terms of the free-space $n-\bar n$ oscillation time,
utilizing that $N\bar N$ potential together with an $NN$ interaction
likewise derived within chiral effective field theory.

[1] Ling-Yun Dai, J. Haidenbauer, U.-G. Meißner, JHEP 07 (2017) 078.
[2] D. Zhou, R.G.E. Timmermans, Phys.Rev.C 86 (2012) 044003.
[3] J. Haidenbauer, U.-G. Meißner, Chin.Phys.C 44 (2020) 033101.