文章基本信息

标题：Light quark masses and pseudoscalar decay constants from Nf=2 Twisted Mass QCD
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作者：V. Lubicz ; S. Simula ; C. Tarantino 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2007
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present the results of the lattice QCD calculation of the average up-down and strange quark masses and of the light meson pseudoscalar decay constants, recently performed with Nf = 2 dynamical fermions by the ETM Collaboration. The simulation is carried out at a single value of the lattice spacing with the twisted mass fermionic action at maximal twist, which guarantees automatic O(a)-improvement of the physical quantities. Quark masses are renormalized by implementing the non perturbative RI-MOM renormalization procedure. Our results for the light quark masses are mMS ud (2 GeV) = 3.85± 0.12±0.40 MeV, mMS s (2 GeV) = 105±3 ±9 MeV and ms/mud = 27.3±0.3±1.2. We also obtain fK = 161.7±1.2±3.1 MeV and the ratio fK/ fp = 1.227±0.009±0.024. From this ratio, by using the experimental determination of G(K→mn¯m (g ))/G(p →mn¯m (g )) and the average value of |Vud| from nuclear beta decays, we obtain |Vus| =0.2192(5)(45), in agreement with the determination from Kl3 decays and the unitarity constraint.