6533b821fe1ef96bd127afad
RESEARCH PRODUCT
Light quark masses and pseudoscalar decay constants from N(f)=2 Lattice QCD with twisted mass fermions
Etm CollaborationB BlossierPh BoucaudP DimopoulosF FarchioniR FrezzottiV GimenezG HerdoizaK JansenV LubiczC MichaelD PalaoM PapinuttoA ShindlerS SimulaC TarantinoC UrbachU Wengersubject
QuarkNuclear and High Energy PhysicsParticle physicsStrange quarkMesonHigh Energy Physics::LatticeWeak decaysLattice field theoryFOS: Physical sciencesLattice QCD[PHYS.HLAT] Physics [physics]/High Energy Physics - Lattice [hep-lat]7. Clean energy01 natural sciencesHigh Energy Physics - LatticeHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciences010306 general physicsQuark masses and SM parametersPhysicsUnitarity[PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat]010308 nuclear & particles physicsHigh Energy Physics - Lattice (hep-lat)High Energy Physics::PhenomenologyFísicaParticle Physics - LatticeLattice QCDFermionSettore FIS/02 - Fisica Teorica Modelli e Metodi Matematici3. Good healthPseudoscalarHigh Energy Physics - Phenomenology[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]Kaon physics; Lattice QCD; Quark masses and SM parameters; Weak decaysHigh Energy Physics::ExperimentKaon physicsdescription
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 m_ud^{msbar}(2 GeV)= 3.85 +- 0.12 +- 0.40 MeV, m_s^{msbar}(2 GeV) = 105 +- 3 +- 9 MeV and m_s/m_ud = 27.3 +- 0.3 +- 1.2. We also obtain fK = 161.7 +- 1.2 +- 3.1 MeV and the ratio fK/fpi=1.227 +- 0.009 +- 0.024. From this ratio, by using the experimental determination of Gamma(K-> mu nu (gamma))/Gamma(pi -> mu nu (gamma)) 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-09-28 |