Speaker
Arkaitz Rodas Bilbao
(Jefferson Lab)
Description
We determine, from Lattice QCD, the elastic $\pi \pi$ scattering amplitude in the three possible isospin channels for various quark masses. We observe that the extraction of the $\sigma$ pole position is very challenging when the state becomes unstable. By performing a full dispersive analysis, we eliminate the systematic uncertainties associated with model extractions, constrain the low energy scattering region, and determine the $\sigma$ pole position with accuracy.
Primary author
Arkaitz Rodas Bilbao
(Jefferson Lab)
Co-authors
Jozef Dudek
(JLab)
Robert Edwards
(Jefferson Lab)
