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Helmes, Christopher; Knippschild, Bastian; Kostrzewa, Bartosz; Liu, Liuming; Jost, Christian; Ottnad, Konstantin; Urbach, Carsten; Wenger, Urs; Werner, Markus (26 March 2018). The η′ meson at the physical point with N f = 2 Wilson twisted mass fermions. EPJ web of conferences, 175, 05025. EDP Sciences 10.1051/epjconf/201817505025