Quenched heavy-light decay constants.
نویسندگان
چکیده
We present results for heavy-light decay constants, using both propagating quarks and the static approximation, inO(a)-improved, quenched lattice QCD. At β = 6.2 on a 243×48 lattice we find fD = 185 + 4 − 3 (stat) + 42 − 7 (syst) MeV, fB = 160 + 6 − 6 + 53 − 19 MeV, fDs/fD = 1.18 + 2 − 2 and fBs/fB = 1.22 + 4 − 3 , in good agreement with earlier studies. From the static theory we obtain f stat B = 253 + 16 − 15 + 105 − 14 MeV. We also present results from a simulation at β = 6.0 on a 163 × 48 lattice, which are consistent with those at β = 6.2. In order to study the effects of improvement, we present a direct comparison of the results using both the Wilson and the improved action at β = 6.0.
منابع مشابه
Quenched Chiral Corrections to Heavy-Light Decay Constants at Order 1/M
Quenched chiral perturbation is used to study the decay constants for heavy-light mesons beyond the leading order in 1/M . The results are used to estimate the error in quenched lattice calculations of the decay constants. For the double ratio R1 = (fDs/fD)/(fBs/fB) we find that the error is small — conservatively 5%, but likely smaller. We also find that quenching decreases the ratio fDs/fD re...
متن کاملHeavy-Light Mesons with Quenched Lattice NRQCD: Results on Decay Constants
We present a quenched lattice calculation of heavy-light meson decay constants, using non-relativistic (NRQCD) heavy quarks in the mass region of the b quark and heavier, and clover-improved light quarks. The NRQCD Hamiltonian and the heavy-light current include the corrections at first order in the expansion in the inverse heavy quark mass. We study the dependence of the decay constants on the...
متن کاملHeavy - light decay constants on the lattice
We present results for the leptonic decays of heavy-light mesons in the quenched approximation and a preliminary result for fD s with dynamical fermions for N f = 2. We examine the systematic effects of extrapolating the decay constants from the charm to the bottom quark mass, and find this extrapolation to be under control. We present a preliminary result for f N f =2 Ds and compare to f N f =...
متن کاملScaling and further tests of heavy meson decay constant determinations from nonrelativistic QCD
We present results for the B s meson decay constant f B s from simulations at three lattice spacings in the range a Ϫ1 ϭ1.1 to 2.6 GeV using NRQCD heavy quarks and clover light quarks in the quenched approximation. We study the scaling of this quantity and check the consistency between mesons decaying from rest and from a state with a nonzero spatial momentum. The cancellation of power law cont...
متن کاملFlavor Breaking in Hadronic Matrix Elements for B − B̄ Oscillations
Results in the quenched approximation for SU(3) breaking ratios of the heavy-light decay constants and the ∆F = 2 mixing matrix elements are reported.
متن کاملB Physics with Nrqcd: a Quenched Study
We present results on the spectrum of B mesons and heavy baryons, using a non-relativistic formulation for the heavy and a clover action for the light quark. We also discuss B meson decay constants and their dependency upon the heavy meson mass.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review. D, Particles and fields
دوره 49 3 شماره
صفحات -
تاریخ انتشار 1994