Axial U(1) symmetry at high temperature in 2-flavor lattice QCD Kei Suzuki, Sinya Aoki, Yasumichi Aoki, Guido Cossu, Hidenori Fukaya and Shoji Hashimoto EPJ Web Conf., 175 (2018) 07025 Published online: 26 March 2018 DOI: 10.1051/epjconf/201817507025