Light quark masses and pseudoscalar decay constants from N(f)=2 Lattice QCD with twisted mass fermions
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Light quark masses and pseudoscalar decay constants from N(f)=2 Lattice QCD with twisted mass fermions

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Light quark masses and pseudoscalar decay constants from N(f)=2 Lattice QCD with twisted mass fermions

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dc.contributor.author Blossier, B.
dc.contributor.author Boucaud, Ph.
dc.contributor.author Dimopoulos, P.
dc.contributor.author Farchioni, F.
dc.contributor.author Frezzotti, R.
dc.contributor.author Giménez Gómez, Vicente
dc.contributor.author Herdoiza, G.
dc.contributor.author Jansen, K.
dc.contributor.author Lubicz, V.
dc.contributor.author Michael, C.
dc.contributor.author Palao Palomares, David
dc.contributor.author Papinutto, Mauro
dc.contributor.author Shindler, A.
dc.contributor.author Simula, S.
dc.contributor.author Tarantino, C.
dc.contributor.author Urbach, C.
dc.contributor.author Wenger, U.
dc.date.accessioned 2014-09-24T11:43:48Z
dc.date.available 2014-09-24T11:43:48Z
dc.date.issued 2008
dc.identifier.uri http://hdl.handle.net/10550/38957
dc.description.abstract We 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 N-f = 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 m(ud)((MS) over bar) (2 GeV) = 3.85 +/- 0.12 +/- 0.40MeV, m(s)((MS) over bar) ( 2 GeV) = 105 +/- 3 +/- 9MeV and m(s)/m(ud) = 27.3 +/- 0.3 +/- 1.2. We also obtain f(K) = 161.7 +/- 1.2 +/- 3.1MeV 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(nu) over bar (mu)(gamma))/ Gamma(pi -> mu(nu) over bar (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 = 0.2192( 5)( 45), in agreement with the determination from K-l3 decays and the unitarity constraint.
dc.language.iso eng
dc.relation.ispartof Journal of High Energy Physics, 2008, vol. 2008, num. 4, p. 020-1-020-23
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Blossier, B. Boucaud, Ph. Dimopoulos, P. Farchioni, F. Frezzotti, R. Giménez Gómez, Vicente Herdoiza, G. Jansen, K. Lubicz, V. Michael, C. Palao Palomares, David Papinutto, Mauro Shindler, A. Simula, S. Tarantino, C. Urbach, C. Wenger, U. 2008 Light quark masses and pseudoscalar decay constants from N(f)=2 Lattice QCD with twisted mass fermions Journal of High Energy Physics 2008 4 020-1 020-23
dc.subject Física
dc.title Light quark masses and pseudoscalar decay constants from N(f)=2 Lattice QCD with twisted mass fermions
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-09-24T11:43:48Z
dc.identifier.doi http://dx.doi.org/10.1088/1126-6708/2008/04/020
dc.identifier.idgrec 041517

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