Speaker
Malwin Niehus
(HISKP)
Description
Recent years have witnessed drastic progress in the computation of hadronic
scattering via lattice QCD. Nevertheless, computations are often performed
at unphysically high pion masses. Here, we extrapolate lattice results of the
anomalous $\gamma^{(*)}\pi\to\pi\pi$ scattering to the physical pion mass via a
dispersive framework, extract the associated chiral anomaly and
the radiative coupling of the $\rho$-resonance
to $\pi\gamma$. In
addition, we confront unitarized 1- and 2-loop ChPT with $\pi\pi\to\pi\pi$ data,
determine the characteristics of the $\rho$ and assess the chiral
convergence. The talk is based on
[arXiv:2110.11372](https://arxiv.org/abs/2110.11372)
and
[arXiv:2009.04479](https://arxiv.org/abs/2009.04479).
Primary author
Malwin Niehus
(HISKP)
Co-authors
Dr
Bastian Kubis
(Bonn University)
Dr
Jacobo Ruiz de Elvira
(HISKP-Bonn)
Martin Hoferichter
(University of Bern)
