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dc.contributor.authorETM, Collaboration-
dc.contributor.authorBlossier, Benoit-
dc.contributor.authorDimopoulos, Petros-
dc.contributor.authorFrezzotti, Roberto-
dc.contributor.authorHaas, Benjamin-
dc.contributor.authorHerdoiza, Gregorio-
dc.contributor.authorJansen, Karl-
dc.contributor.authorLubicz, Vittorio-
dc.contributor.authorMescia, Federico-
dc.contributor.authorPalao, David-
dc.contributor.authorShindler, Andrea-
dc.contributor.authorSimula, Silvano-
dc.contributor.authorTarantino, Cecilia-
dc.contributor.authorUrbach, Carsten-
dc.description.abstractWe present the results of a lattice QCD calculation of the pseudoscalar meson decay constants fπ, fK, fD and fDs, performed with Nf=2 dynamical fermions. The simulation is carried out with the tree-level improved Symanzik gauge action and with the twisted mass fermionic action at maximal twist. We have considered for the final analysis three values of the lattice spacing, a = 0.10 fm, 0.09 fm and 0.07 fm, with pion masses down to mπ = 270 MeV. Our results for the light meson decay constants are fK = 158.1(2.4) MeV and fK/fπ = 1.210(18). From the latter 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| = 0.2222(34), in good agreement with the determination from semileptonic Kl3 decays and the unitarity constraint. For the D and Ds meson decay constants we obtain fD = 197(9) MeV, fDs = 244(8) MeV and fDs/fD = 1.24(3). Our result for fD is in good agreement with the CLEO experimental measurement. For fDs our determination is smaller than the PDG 2008 experimental average but in agreement with a recent improved measurement by CLEO at the 1.4 σ level.en
dc.relation.ispartofJournal of High Energy Physicsen
dc.subjectLattice QCDen
dc.subjectHeavy Quark Physicsen
dc.subjectKaon Physicsen
dc.titlePseudoscalar decay constants of kaon and D-mesons from Nf=2 twisted mass Lattice QCDen
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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