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Title: Pseudoscalar decay constants of kaon and D-mesons from N-f=2 twisted mass Lattice QCD
Authors: Blossier, Benoît
Dimopoulos, Pedro
Frezzotti, Roberto
Haas, Benjamin
Herdoiza, Gregorio
Jansen, Karl
Lubicz, Vittorio
Mescia, Federico
Palao, David
Shindler, Andrea
Simula, Silvano
Tarantino, Cecilia
Urbach, Carsten
Wenger, Urs
Issue Date: Jul-2009
Publisher: International School for Advanced Studies
Abstract: We 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.
Description: SISSA
ISSN: 1126-6708
DOI: 10.1088/1126-6708/2009/07/043
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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