The η′ meson at the physical point with Nf = 2 Wilson twisted mass fermionsChristopher Helmes, Bastian Knippschild, Bartosz Kostrzewa, Liuming Liu, Christian Jost, Konstantin Ottnad, Carsten Urbach, Urs Wenger and Markus WernerEPJ Web Conf., 175 (2018) 05025DOI: https://doi.org/10.1051/epjconf/201817505025