Speaker
Oleksandra Deineka
(Johannes Gutenberg University of Mainz)
Description
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) shows up. As an application, I will show our recent results on $e^+e^-→J/\psi \pi\pi(KK)$ and $\gamma^*\gamma^*\to \pi\pi(KK)$ scattering. The input from the latter allowed us to perform a dispersive estimation of the $f_0(980)$ contribution to $(g-2)_\mu$. My talk will be based on [2012.11636, 2004.13499, 2004.13499, 1909.04158].
Primary authors
Igor Danilkin
(Johannes Gutenberg University of Mainz)
Oleksandra Deineka
(Johannes Gutenberg University of Mainz)
