Topological Susceptibility in Nf = 2 QCD at Finite Temperature

Sinya Aoki; Yasumichi Aoki; Guido Cossu; Hidenori Fukaya; Shoji Hashimoto; Kei Suzuki

doi:10.1051/epjconf/201817507024

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EPJ Web of Conferences 175, 07024 (2018)
https://doi.org/10.1051/epjconf/201817507024

Topological Susceptibility in N_f = 2 QCD at Finite Temperature

Sinya Aoki¹, Yasumichi Aoki²^,3^*, Guido Cossu⁴, Hidenori Fukaya⁵, Shoji Hashimoto²^,6 and Kei Suzuki²

¹ Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
² High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
³ RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, USA
⁴ School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
⁵ Department of Physics, Osaka University, Osaka 560-0043, Japan
⁶ SOKENDAI (The Graduate University for Advanced Studies), Tsukuba, Ibaraki 305-0801, Japan

^* Speaker, e-mail: yasumichi.aoki@kek.jp

Published online: 26 March 2018

Abstract

We study the topological charge in N_f = 2 QCD at finite temperature using Möbius domain-wall fermions. The susceptibility X_t of the topological charge defined either by the index of overlap Dirac operator or a gluonic operator is investigated at several values of temperature T (> T_c) varying the quark mass. A strong suppression of the susceptibility is observed below a certain value of the quark mass. The relation with the restoration of U_A(1) is discussed.

© The Authors, published by EDP Sciences, 2018

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).