Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/526
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dc.contributor.authorBlossier, Benoît-
dc.contributor.authorDimopoulos, Pedro-
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.contributor.authorWenger, Urs-
dc.date.accessioned2011-07-18T13:26:13Z-
dc.date.available2011-07-18T13:26:13Z-
dc.date.issued2009-07-
dc.identifier.issn1126-6708-
dc.identifier.urihttp://hdl.handle.net/2307/526-
dc.descriptionSISSAit_IT
dc.description.abstractWe present the results of a lattice QCD calculation of the pseudoscalar meson decay constants f(pi), f(K), f(D) and f(Ds), performed with N-f =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 similar or equal to 0.10 fm, 0.09 fm and 0.07 fm, with pion masses down to m(pi) similar or equal to 270 MeV. Our results for the light meson decay constants are f(K) =158.1(2.4) MeV and f(K)/f(pi) = 1.210(18). From the latter ratio, by using the experimental determination of Gamma(K -> munu(mu)(gamma))/Gamma(pi -> mu nu(mu)(gamma)) and the average value of vertical bar V-ud vertical bar from nuclear beta decays, we obtain vertical bar V-us vertical bar = 0.2222(34), in good agreement with the determination from semileptonic K-13 decays and the unitarity constraint. For the D and D-s meson decay constants we obtain f(D) =197(9) MeV, f(Ds) = 244(8) MeV and f(Ds)/f(D) = 1.24(3). Our result for f(D) is in good agreement with the CLEO experimental measurement. For f(Ds) our determination is smaller than the PDG 2008 experimental average but in agreement with a recent improved measurement by CLEO at the 1.4 sigma level.it_IT
dc.language.isoenit_IT
dc.publisherInternational School for Advanced Studiesit_IT
dc.relation.ispartofJournal of high energy physicsit_IT
dc.subjectCHIRAL PERTURBATION-THEORYit_IT
dc.subjectYANG-MILLS THEORYit_IT
dc.subjectLIGHT QUARKSit_IT
dc.subjectFERMIONSit_IT
dc.titlePseudoscalar decay constants of kaon and D-mesons from N-f=2 twisted mass Lattice QCDit_IT
dc.typeArticleen
dc.subject.miurSettori Disciplinari MIUR::Scienze fisiche::FISICA NUCLEARE E SUBNUCLEAREit_IT
dc.subject.isicruiCategorie ISI-CRUI::Scienze fisiche::Physicsit_IT
dc.subject.anagraferoma3Scienze fisicheit_IT
dc.relation.volumenumber2009it_IT
dc.relation.pagenumber043it_IT
dc.identifier.urlhttp://arxiv.org/abs/0904.0954-
dc.identifier.doi10.1088/1126-6708/2009/07/043-
dc.relation.issuenumber7it_IT
item.fulltextWith Fulltext-
item.languageiso639-1other-
item.grantfulltextrestricted-
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'
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