# The 34th International Symposium on Lattice Field Theory (Lattice 2016)

24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

## The Roberge-Weiss endpoint in $N_f=2+1$ QCD at the physical point

25 Jul 2016, 18:05
20m
Building 32 Room 1015 (Highfield Campus, University of Southampton)

### Building 32 Room 1015

#### Highfield Campus, University of Southampton

Talk Nonzero Temperature and Density

### Speaker

Mr Michele Mesiti (University of Pisa and INFN - Sezione di Pisa)

### Description

In this talk I will report on our recent results about the determination of the position and the nature of the Roberge-Weiss endpoint. Our study is performed in $N_f=2+1$ QCD, with physical quark masses, making use of stout-improved staggered fermions and of the tree level Symanzik improvement for the gauge action. We study the theory at 4 different lattice spacings, corresponding to $N_t=4,6,8$ and $10$, and at different spatial sizes. The finite size scaling analysis performed on $N_t=4$ and $6$ lattices indicates that the Roberge-Weiss transition at the endpoint is of the 2nd order kind, in the 3D Ising universality class, while the continuum limit of the critical temperature is found to be $T_{RW}=208(5)$ MeV.

### Primary authors

Dr Claudio Bonati (Università di Pisa) Dr Francesco Negro (Universita' di Pisa and INFN - Sezione di Pisa) Dr Francesco Sanfilippo (University of Southampton) Dr Marco Mariti (Univesita' di Pisa and INFN - Sezione di Pisa) Prof. Massimo D'Elia (Universita' di Pisa and INFN - Sezione di Pisa) Mr Michele Mesiti (University of Pisa and INFN - Sezione di Pisa)

 Slides