Simulating twisted mass fermions at physical light, strange, and charm quark masses
Constantia Alexandrou (Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Konstantinou Kavafi Street, 2121 Nicosia, Cyprus); Simone Bacchio (Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany); Panagiotis Charalambous (Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Konstantinou Kavafi Street, 2121 Nicosia, Cyprus); Petros Dimopoulos (Dip. di Fisica, Università and INFN di Roma Tor Vergata, 00133 Roma, Italy, Centro Fermi—Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Piazza del Viminale 1, 00184 Rome, Italy); Jacob Finkenrath (Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Konstantinou Kavafi Street, 2121 Nicosia, Cyprus); et al - Show all 14 authors
We present the QCD simulation of the first gauge ensemble of two degenerate light quarks, a strange and a charm quark with all quark masses tuned to their physical values within the twisted mass fermion formulation. Results for the pseudoscalar masses and decay constants confirm that the produced ensemble is indeed at the physical parameters of the theory. This conclusion is corroborated by a complementary analysis in the baryon sector. We examine cutoff and isospin breaking effects and demonstrate that they are suppressed through the presence of a clover term in the action.
