0000000001173554

AUTHOR

V Lubicz

showing 2 related works from this author

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

2007

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 …

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 physics
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B-K-parameter from N-f=2 twisted mass lattice QCD

2011

We present an unquenched N-f = 2 lattice computation of the B-K parameter which controls K-0 - (K) over bar (0) oscillations. A partially quenched setup is employed with two maximally twisted dynamical (sea) light Wilson quarks, and valence quarks of both the maximally twisted and the Osterwalder-Seiler variety. Suitable combinations of these two kinds of valence quarks lead to a lattice definition of the B-K parameter which is both multiplicatively renormalizable and O(a) improved. Employing the nonperturbative RI-MOM scheme, in the continuum limit and at the physical value of the pion mass we get B-K(RGI) = 0.729 +/- 0.030, a number well in line with the existing quenched and unquenched d…

K-antiK mixing; indirect CP violation; Lattice QCDHigh Energy Physics::LatticeHigh Energy Physics::Phenomenologyindirect CP violationFísicaK-antiK mixingLattice QCDSettore FIS/02 - Fisica Teorica Modelli e Metodi Matematici
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