Speaker
Arkaitz Rodas
(Jefferson Lab)
Description
We determine, from Lattice QCD, the elastic $\pi \pi$ scattering amplitudes in the three possible isospin channels and the $\sigma$ resonance. We extract its lineshape for several different quark masses corresponding with the state transitioning from bound to resonance. The extraction of the $\sigma$ pole position becomes very challenging when the state is unstable. We perform the first full dispersive analysis over lattice QCD data to reduce the systematic uncertainties and extract the resonance with high accuracy and improved precision.
Primary author
Arkaitz Rodas
(Jefferson Lab)
