6533b7dbfe1ef96bd1270b3d
RESEARCH PRODUCT
Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks
Hubert SimmaNicolas GarronRainer SommerBenoit BlossierAntoine GérardinMichele Della MorteMichele Della MorteJohn BulavaPatrick FritzschFabio BernardoniJochen HeitgerGeorg M. Von Hippelsubject
QuarkParticle physicsNuclear and High Energy PhysicsHigh Energy Physics::LatticeHadronLattice field theoryNuclear Theoryhep-latFOS: Physical sciencesLattice QCD01 natural sciencesNuclear physicsRenormalizationPionHigh Energy Physics - LatticeHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesMeson decayB mesonddc:530010306 general physicsNuclear ExperimentQuantum chromodynamicsPhysicsHeavy Quark Effective Theory010308 nuclear & particles physics[PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat]High Energy Physics - Lattice (hep-lat)High Energy Physics::Phenomenologyhep-phLattice QCDHigh Energy Physics - PhenomenologyBottom quarks[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]High Energy Physics::Experimentdescription
We present a computation of B-meson decay constants from lattice QCD simulations within the framework of Heavy Quark Effective Theory for the b-quark. The next-to-leading order corrections in the HQET expansion are included non-perturbatively. Based on Nf=2 gauge field ensembles, covering three lattice spacings a (0.08-0.05)fm and pion masses down to 190MeV, a variational method for extracting hadronic matrix elements is used to keep systematic errors under control. In addition we perform a careful autocorrelation analysis in the extrapolation to the continuum and to the physical pion mass limits. Our final results read fB=186(13)MeV, fBs=224(14)MeV and fBs/fB=1.203(65). A comparison with other results in the literature does not reveal a dependence on the number of dynamical quarks, and effects from truncating HQET appear to be negligible.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-04-14 |