Matrix elements of heavy - light mesons from a fine lattice
نویسنده
چکیده
We performed a calculation of matrix elements of heavy mesons on a quenched lattice, generated with Wilson gauge fields at β = 6.6 with a lattice size of 403 ×80 and a lattice spacing a−1 ≃ 5 GeV determined from the Sommer parameter r0 = 0.5 fm. We use a non-perturbatively O(a) improved Wilson fermion action and improved currents. We have calculated the charmonium spectrum as well as form factors of semileptonic decays of pseudoscalar heavy-light mesons containing a c or a b quark to pseudoscalar light mesons through a vector current:
منابع مشابه
Semileptonic decay of a heavy-light pseudoscalar to a light vector meson
Semileptonic decays of heavy-light mesons are of interest because they can be used to determine elements of the CKM matrix. The nonperturbative QCD information needed to understand a decay can be calculated in lattice QCD. In the case of the decays D → K∗ and Ds → φ the branching ratios have been accurately measured and the relevant CKM matrix element (Vcs) is well determined by other methods [...
متن کاملHeavy-Meson Observables at One-Loop in Partially Quenched Chiral Perturbation Theory
I present one-loop level calculations of the Isgur-Wise functions for B → D(∗)eν, of the matrix elements of isovector twist-2 operators in B and D mesons, and the matrix elements for the radiative decays D∗ → Dγ in partially quenched heavy quark chiral perturbation theory. Such expressions are required in order to extrapolate from the light quark masses used in lattice simulations of the forese...
متن کاملHeavy-light meson’s physics in Lattice QCD
The possibility of revealing new physics by studying the flavor sector of the Standard Model strongly depends upon the accuracy that will be achieved in (near) future lattice QCD calculations and, in particular, on heavy-light meson’s observables. In turn, handling with heavy-light mesons on the lattice is a challenging problem, because of the presence of two largely separated energy scales, an...
متن کاملPoint-Split Lattice Operators for B Decays
The matrix element which determines the B meson decay constant can be measured on the lattice using an effective field theory for heavy quarks. Various discretizations of the heavy-light bilinears which appear in this and other B decay matrix elements are possible. The heavy-light bilinear currently used for the determination of the B meson decay constant on the lattice suffers a substantial on...
متن کاملStatus and Prospects for Lattice Calculations in Heavy Quark Physics
The current status of lattice calculation of weak matrix elements for heavy quark systems is reviewed. After an assessment of systematic errors in present simulations, results for the B meson decay constant, the B parameter BB and semi-leptonic heavy-to-light and heavy-to-heavy transitions are discussed. The final topic are lattice results for heavy baryon spectroscopy.
متن کامل