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Title: Light quark masses and pseudoscalar decay constants from Nf=2 lattice QCD with twisted mass fermions
Authors: Blossier, B.
Boucaud, Ph.
Dimopoulos, P.
Farchioni, F.
Frezzotti, R.
Gimenez, V.
Herdoiza, G.
Jansen, K.
Lubicz, Vittorio
Michael, C.
Palao, D.
Papinutto, M.
Shindler, A.
Simula, Silvano
Tarantino, C.
Urbach, C.
Wenger, U.
Keywords: Lattice QCD
Weak Decays
Kaon Physics
Quark Masses
Standard Model parameters
Issue Date: 7-Apr-2008
Publisher: Institute of Physics Publishing
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 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.
DOI: 10.1088/1126-6708/2008/04/020
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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