# XIV Hadron Physics 2018

18-23 March 2018
Florianopolis, Brazil
America/Sao_Paulo timezone

## Sigma resonance parameters from lattice QCD

19 Mar 2018, 16:00
1h
Florianopolis, Brazil

Poster

### Speaker

Raquel Molina Peralta

### Description

The sigma resonance has been a long standing puzzle in both, theory and experiment. Because its non-Breit Wigner shape, the extraction of its properties is not straightforward. Dispersive analysis techniques are needed to extract the properties of the resonance. Lately, several lattice data groups have performed a calculation of phase shifts for $\pi \pi$ scattering in the Isospin = 0, Spin = 0 channel. Unitary Chiral Perturbation Theory provides a framework which is based in chiral symmetry and unitarity constraints useful to extract the properties of resonances from the lattice. The formalism is implemented in the finite volume to analyse the energy levels extracted from the lattice data. Then, the pion mass dependence is investigated providing extrapolations to the physical point.

### Primary authors

Prof. Andrei Alexandru (GWU) Mrs Dehua Guo (GWU) Prof. Michael Doring (GWU)

### Presentation materials

 GAMMD-arxive-pro.pdf Sigma resonance parameters from a Nf=2 lattice QCD simulation