Computation of the heavy-light decay constant using nonrelativistic lattice QCD.
نویسنده
چکیده
We report results on a lattice calculation of the heavy-light meson decay constant employing the non-relativistic QCD approach for heavy quark and Wilson action for light quark. Simulations are carried out at β = 6.0 on a 16 × 48 lattice. Signal to noise ratio for the ground state is significantly improved compared to simulations in the static approximation, enabling us to extract the decay constant reliably. We compute the heavy-light decay constant for several values of heavy quark mass and estimate the magnitude of the deviation from the heavy mass scaling law fP √ mP = const. For the B meson we find fB = 171±22 −45 MeV, while an extrapolation to the static limit yields f static B = 297± 36 −30 MeV.
منابع مشابه
Scaling 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 کاملDecay constants of P - wave heavy - light mesons from unquenched lattice QCD
We review some decays that require knowledge of the decay constants of 0 + heavy-light mesons. We compute the decay constants of P-wave heavy-light mesons from unquenched lattice QCD at a single lattice spacing. For the charm-strange meson we obtain the decay constant: fD s 0 + = 340(110) MeV using our normalisation conventions. We obtain the f static Ps (static-strange P-wave) decay constant a...
متن کاملComputation of the Heavy-Light Decay Constant with NRQCD
Non-relativistic QCD is applied for a lattice computation of the heavy-light meson decay constant in quenched approximation at β = 6.0. Clear signals are obtained for the ground state at large times in the correlators, allowing a reliable extraction of the decay constant. Estimating the current renormalization factor by the tadpole improvement procedure, we find fB = 164(17) MeV for the B meson...
متن کاملComparison of potential models through HQETJames
I calculate heavy-light decay constants in a nonrelativistic potential model. The resulting estimate of heavy quark symmetry breaking connicts with similar estimates from lattice QCD. I show that a semirelativistic potential model eliminates the connict. Using the results of heavy quark eeective theory allows me to identify and compensate for shortcomings in the model calculations in addition t...
متن کاملComparison of potential models through HQET
I calculate heavy-light decay constants in a nonrelativistic potential model. The resulting estimate of heavy quark symmetry breaking conflicts with similar estimates from lattice QCD. I show that a semirelativistic potential model eliminates the conflict. Using the results of heavy quark effective theory allows me to identify and compensate for shortcomings in the model calculations in additio...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review. D, Particles and fields
دوره 50 7 شماره
صفحات -
تاریخ انتشار 1994