Topological susceptibility of Nf = 2 + 1 QCD from staggered fermions spectral projectors at high temperatures

Journal of High Energy Physics

Regular Article - Theoretical Physics

Antonino Todaro¹  Giuseppe Clemente²  Guido Martinelli³  Claudio Bonanno⁴  Francesco Sanfilippo⁵  Claudio Bonati⁶  Massimo D’Elia⁶  Francesco D’Angelo⁶  Lorenzo Maio⁶  Andreas Athenodorou⁷ 

[1]Department of Physics, University of Cyprus, P.O. Box 20537, 1678, Nicosia, Cyprus

[2]Faculty of Mathematics and Natural Sciences, University of Wuppertal, 42119, Wuppertal, Germany

[3]Dipartimento di Fisica, Università di Roma “Tor Vergata”, Via della Ricerca Scientifica 1, I-00133, Rome, Italy

[4]Deutsches Elektronen-Synchrotron (DESY), Platanenallee 6, 15738, Zeuthen, Germany

[5]Dipartimento di Fisica and INFN Sezione di Roma “La Sapienza”, Piazzale Aldo Moro 5, I-00185, Rome, Italy

[6]INFN Sezione di Firenze, Via G. Sansone 1, I-50019, Sesto Fiorentino, Firenze, Italy

[7]INFN Sezione di Roma Tre, Via della Vasca Navale 84, I-00146, Rome, Italy

[8]Università di Pisa and INFN Sezione di Pisa, Largo B. Pontecorvo 3, I-56127, Pisa, Italy

[9]Università di Pisa and INFN Sezione di Pisa, Largo B. Pontecorvo 3, I-56127, Pisa, Italy

[10]Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Str., 2121, Nicosia, Cyprus

关键词: Lattice QCD;    Vacuum Structure and Confinement;    Axions and ALPs;    CP Violation;   

DOI  :  10.1007/JHEP10(2022)197

 received in 2022-08-29, accepted in 2022-10-15,  发布年份 2022

来源: Springer

【 摘 要 】

We compute the topological susceptibility of Nf = 2 + 1 QCD with physical quark masses in the high-temperature phase, using numerical simulations of the theory discretized on a space-time lattice. More precisely we estimate the topological susceptibility for five temperatures in the range from ∼ 200 MeV up to ∼ 600 MeV, adopting the spectral projectors definition of the topological charge based on the staggered Dirac operator. This strategy turns out to be effective in reducing the large lattice artifacts which affect the standard gluonic definition, making it possible to perform a reliable continuum extrapolation. Our results for the susceptibility in the explored temperature range are found to be partially in tension with previous determinations in the literature.

【 授权许可】

Unknown   
© The Author(s) 2022