Light quark masses and pseudoscalar decay constants from Nf=2 twisted mass QCD

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dc.creatorLubicz, Vittorio
dc.creatorSimula, Silvano
dc.creatorTarantino, Cecilia
dc.date2007-10-01
dc.date.accessioned2026-07-07T13:02:46Z
dc.date.available2026-07-07T13:02:46Z
dc.descriptionWe 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 m_{ud}^{MSbar}(2 Gev)=3.85 +- 0.12 +- 0.40 MeV, m_s^{MSbar}(2 Gev)=105 +- 3 +- 9 MeV and m_s/m_{ud}=27.3 +- 0.3 +- 1.2. We also obtain f_K=161.7 +- 1.2 +- 3.1 MeV and the ratio f_K/f_pi=1.227 +- 0.009 +- 0.024. From this ratio, by using the experimental determination of Gamma(K -> mu {bar nu}_mu (gamma))/Gamma(pi -> mu {bar nu}_mu (gamma)) and the average value of |V_{ud}| from nuclear beta decays, we obtain |V_{us}|=0.2192(5)(45), in agreement with the determination from K_{l3} decays and the unitarity constraint.
dc.description7 pages, 3 figures, Proceedings of Lattice 2007 (July 30 - 4 August 2007, Regensburg, Germany)
dc.identifierhttps://arxiv.org/abs/0710.0329
dc.identifierhttp://arxiv.org/abs/0710.0329
dc.identifierPoSLAT2007:374,2007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/226561
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLight quark masses and pseudoscalar decay constants from Nf=2 twisted mass QCD
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