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dc.contributor.authorBlossier, B.-
dc.contributor.authorBoucaud, Ph.-
dc.contributor.authorDimopoulos, P.-
dc.contributor.authorFarchioni, F.-
dc.contributor.authorFrezzotti, R.-
dc.contributor.authorGimenez, V.-
dc.contributor.authorHerdoiza, G.-
dc.contributor.authorJansen, K.-
dc.contributor.authorLubicz, Vittorio-
dc.contributor.authorMichael, C.-
dc.contributor.authorPalao, D.-
dc.contributor.authorPapinutto, M.-
dc.contributor.authorShindler, A.-
dc.contributor.authorSimula, Silvano-
dc.contributor.authorTarantino, C.-
dc.contributor.authorUrbach, C.-
dc.contributor.authorWenger, U.-
dc.description.abstractWe present the results of a lattice QCD calculation of the average up-down and strange quark masses and of the light meson pseudoscalar decay constants with Nf=2 dynamical fermions. 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 mud(MSbar,2 GeV) = 3.85 ± 0.12 ± 0.40 MeV, ms(MSbar,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/fπ = 1.227 ± 0.009 ± 0.024. From this ratio, by using the experimental determination of Γ(K → μbar nuμ(γ))/Γ(π → μbar nuμ(γ)) 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.en
dc.publisherInstitute of Physics Publishingen
dc.relation.ispartofJournal of High Energy Physicsen
dc.rightsIOP Publishingen
dc.subjectLattice QCDen
dc.subjectWeak Decaysen
dc.subjectKaon Physicsen
dc.subjectQuark Massesen
dc.subjectStandard Model parametersen
dc.titleLight quark masses and pseudoscalar decay constants from Nf=2 lattice QCD with twisted mass fermionsen
dc.subject.miurSettori Disciplinari MIUR::Scienze fisiche::FISICA TEORICA, MODELLI E METODI MATEMATICIen
dc.subject.miurScienze fisiche-
dc.subject.isicruiCategorie ISI-CRUI::Scienze fisiche::Physicsen
dc.subject.isicruiScienze fisiche-
dc.subject.anagraferoma3Scienze fisicheen
dc.description.romatrecurrentDipartimento di Fisica 'Edoardo Amaldi'*
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