D-meson decay constants and a check of factorization in non-leptonic B-decays

Bečirević, Damir; Lubicz, V.; Sanfilippo, Francesco; Simula, Silvano; Tarantino, Cecilia

doi:10.1007/jhep02(2012)042

Cited by 67 publications

(74 citation statements)

References 54 publications

(76 reference statements)

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“…Our result of the ratios f D * s / f D * = 1.13 is also in good agreement with other theoretical model calculations such as 1.16 ± 0.02 ± 0.06 from the lattice QCD [54] and 1.10 ± 0.06 from the BS model [56].…”

Section: Fig 2 (Color Online) Fit Of the Ground State Meson Massessupporting

confidence: 92%

Variational analysis of mass spectra and decay constants for ground state pseudoscalar and vector mesons in the light-front quark model

Choi

et al. 2015

Phys. Rev. C

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Using the variational principle, we compute mass spectra and decay constants of ground state pseudoscalar and vector mesons in the light-front quark model (LFQM) with the QCD-motivated effective Hamiltonian including the hyperfine interaction. By smearing out the Dirac delta function in the hyperfine interaction, we avoid the issue of negative infinity in applying the variational principle to the computation of meson mass spectra and provide analytic expressions for the meson mass spectra. Our analysis with the smeared hyperfine interaction indicates that the interaction for the heavy meson sector including the bottom and charm quarks gets more pointlike. We also consider the flavor mixing effect in our analysis and determine the mixing angles from the mass spectra of (ω, φ ) and (η, η ). Our variational analysis with the trial wave function including the two lowest order harmonic oscillator basis functions appears to improve the agreement with the data of meson decay constants and the heavy meson mass spectra over the previous computation handling the hyperfine interaction as perturbation.

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Section: Fig 2 (Color Online) Fit Of the Ground State Meson Massessupporting

confidence: 92%

Variational analysis of mass spectra and decay constants for ground state pseudoscalar and vector mesons in the light-front quark model

Choi

et al. 2015

Phys. Rev. C

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“…The decay constants can also be calculated in lattice QCD [41,47,48] and good agreement with experiment is found. Since heavyonium pseudoscalar mesons do not annihilate to a single particle, there is no direct experimental determination of the decay constant.…”

Section: Discussionsupporting

confidence: 54%

B-meson decay constants: A more complete picture from full lattice QCD

et al. 2015

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We extend the picture of B-meson decay constants obtained in lattice QCD beyond those of the B, B s and B c to give the first full lattice QCD results for the B Ã , B Ã s and B Ã c . We use improved nonrelativistic QCD for the valence b quark and the highly improved staggered quark (HISQ) action for the lighter quarks on gluon field configurations that include the effect of u=d, s and c quarks in the sea with u=d quark masses going down to physical values. For the ratio of vector to pseudoscalar decay constants, we find f B Ã =f B ¼ 0.941ð26Þ, f B Ã s =f B s ¼ 0.953ð23Þ (both 2σ less than 1.0) and f B Ã c =f B c ¼ 0.988ð27Þ. Taking correlated uncertainties into account we see clear indications that the ratio increases as the mass of the lighter quark increases. We compare our results to those using the HISQ formalism for all quarks and find good agreement both on decay constant values when the heaviest quark is a b and on the dependence on the mass of the heaviest quark in the region of the b. Finally, we give an overview plot of decay constants for gold-plated mesons, the most complete picture of these hadronic parameters to date.

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“…M1 could, if it persists, indicate a hint at new physics [52,53]. For example, in a multiple-Higgs extension to the standard model, one would speculate that the η exp.…”

Section: Discussionmentioning

confidence: 99%

Hindered M1 radiative decay ofϒ(2S)from lattice NRQCD

et al. 2015

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We present a calculation of the hindered M1 Υ(2S) → η b (1S)γ decay rate using lattice nonrelativistic QCD. The calculation includes spin-dependent relativistic corrections to the NRQCD action through O(v 6 ) in the quark's relative velocity, relativistic corrections to the leading order current which mediates the transition through the quark's magnetic moment, radiative corrections to the leading spin-magnetic coupling and for the first time a full error budget. We also use gluon field ensembles at multiple lattice spacing values, all of which include u, d, s and c quark vacuum polarisation. Our result for the branching fraction is B(Υ(2S) → η b (1S)γ) = 5.4(1.8) × 10 −4 , which agrees with the current experimental value.

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D-meson decay constants and a check of factorization in non-leptonic B-decays

Cited by 67 publications

References 54 publications

Variational analysis of mass spectra and decay constants for ground state pseudoscalar and vector mesons in the light-front quark model

Variational analysis of mass spectra and decay constants for ground state pseudoscalar and vector mesons in the light-front quark model

B-meson decay constants: A more complete picture from full lattice QCD

Hindered M1 radiative decay ofϒ(2S)from lattice NRQCD

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