Up, down, strange and charm quark masses withNf=2+1+1twisted mass lattice QCD
| Autor: | Petros Dimopoulos, Roberto Frezzotti, Cecilia Tarantino, E. Picca, P. Lami, S. Reker, Gregorio Herdoiza, Vittorio Lubicz, D. Palao, Albert Deuzeman, N Carrasco, V. Gimenez, Francesco Sanfilippo, Urs Wenger, Silvano Simula, L. Riggio, Luigi Scorzato, G. C. Rossi, Carsten Urbach |
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| Rok vydání: | 2014 |
| Předmět: |
Quark
Physics Quantum chromodynamics Nuclear and High Energy Physics Strange quark Particle physics High Energy Physics::Lattice High Energy Physics::Phenomenology Nuclear Theory Lattice QCD 7. Clean energy Sigma baryon Charm quark Nuclear physics Pion Up quark High Energy Physics::Experiment Nuclear Experiment |
| Zdroj: | Nuclear Physics B. 887:19-68 |
| ISSN: | 0550-3213 |
| Popis: | We present a lattice QCD calculation of the up, down, strange and charm quark masses performed using the gauge configurations produced by the European Twisted Mass Collaboration with N f = 2 + 1 + 1 dynamical quarks, which include in the sea, besides two light mass degenerate quarks, also the strange and charm quarks with masses close to their physical values. The simulations are based on a unitary setup for the two light quarks and on a mixed action approach for the strange and charm quarks. The analysis uses data at three values of the lattice spacing and pion masses in the range 210 – 450 MeV , allowing for accurate continuum limit and controlled chiral extrapolation. The quark mass renormalization is carried out non-perturbatively using the RI′-MOM method. The results for the quark masses converted to the MS ¯ scheme are: m u d ( 2 GeV ) = 3.70 ( 17 ) MeV , m s ( 2 GeV ) = 99.6 ( 4.3 ) MeV and m c ( m c ) = 1.348 ( 46 ) GeV . We obtain also the quark mass ratios m s / m u d = 26.66 ( 32 ) and m c / m s = 11.62 ( 16 ) . By studying the mass splitting between the neutral and charged kaons and using available lattice results for the electromagnetic contributions, we evaluate m u / m d = 0.470 ( 56 ) , leading to m u = 2.36 ( 24 ) MeV and m d = 5.03 ( 26 ) MeV . |
| Databáze: | OpenAIRE |
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