#### Resonances and scattering states in lattice QCD: the pion-nucleon system

- Event time: 2:00pm
- Event date: 9th December 2013
- Speaker: Valentina Verduci (Formerly School of Physics & Astronomy, University of Edinburgh)
- Location: Higgs Centre Seminar Room, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

Most of the hadrons that constitute the QCD spectrum are unstable under strong interactions. Lattice QCD calculations have been historically treating these state as stable states, without taking into account their resonant nature and their coupled decay channels. In the last years new techniques have been developed and the study of two particle systems in lattice QCD has become an accessible challenge. I will present some results relative to the pion-nucleon coupled system in S-wave, which appears to be crucial for a better understanding of the negative parity nucleon spectrum. I will explain which are the main obstacles encountered in this type of calculation and why the distillation method and the phase shift analysis turn out to be essential tools in this approach.

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..