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.
@article{arxiv.1807.00495,
title = {Simulating twisted mass fermions at physical light, strange and charm quark masses},
author = {Constantia Alexandrou and Simone Bacchio and Panagiotis Charalambous and Petros Dimopoulos and Jacob Finkenrath and Roberto Frezzotti and Kyriakos Hadjiyiannakou and Karl Jansen and Giannis Koutsou and Bartosz Kostrzewa and Mariane Mangin-Brinet and Giancarlo Rossi and Silvano Simula and Carsten Urbach},
journal= {arXiv preprint arXiv:1807.00495},
year = {2018}
}