TY  - JOUR
AU  - Bonati, Claudio
AU  - Calore, Enrico
AU  - D’Elia, Massimo
AU  - Mesiti, Michele
AU  - Negro, Francesco
AU  - Sanfilippo, Francesco
AU  - Schifano, Sebastiano Fabio
AU  - Silvi, Giorgio
AU  - Tripiccione, Raffaele
TI  - Roberge-Weiss endpoint and chiral symmetry restoration in N f = 2 + 1 QCD
JO  - Physical review / D
VL  - 99
IS  - 1
SN  - 2470-0010
CY  - Melville, NY
PB  - Inst.812068
M1  - FZJ-2019-01784
SP  - 014502
PY  - 2019
AB  - We investigate the fate of the Roberge-Weiss endpoint transition and its connection with the restoration of chiral symmetry as the chiral limit of Nf=2+1 QCD is approached. We adopt a stout staggered discretization on lattices with Nt=4 sites in the temporal direction; the chiral limit is approached maintaining a constant physical value of the strange-to-light mass ratio and exploring three different light quark masses, corresponding to pseudo-Goldstone pion masses mπ≃100, 70 and 50 MeV around the transition. A finite size scaling analysis provides evidence that the transition remains second order, in the 3D Ising universality class, in all the explored mass range. The residual chiral symmetry of the staggered action also allows us to investigate the relation between the Roberge-Weiss endpoint transition and the chiral restoration transition as the chiral limit is approached: our results, including the critical scaling of the chiral condensate, are consistent with a coincidence of the two transitions in the chiral limit; however we are not able to discern the symmetry controlling the critical behavior, because the critical indices relevant to the scaling of the chiral condensate are very close to each other for the two possible universality classes [3D Ising or O(2)].
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000454769000004
DO  - DOI:10.1103/PhysRevD.99.014502
UR  - https://juser.fz-juelich.de/record/861287
ER  -