Bs→Ds/B→Dsemileptonic form-factor ratios and their application toBR(Bs0→μ+μ−)

2012/02/29 by Jon A. Bailey, A. Bazavov, C. Bernard +32 · 64 citations
Physics and Astronomy · #Atomic physics #Bar (unit) #High-Energy Particle Collisions Research #Lattice (music) #Lattice QCD #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Recoil #hep-ex #hep-lat

paper · pdf · doi:10.1103/physrevd.85.114502

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 85(11) (American Physical Society) · 30 pages, 11 figures. Fig. 1 updated. Table II added. Conforms with version published in Physical Review D, except typos fixed, as in the PRD Erratum, in Table V (previously Table IV in arXiv v1). Results unchanged

openalex publication_date 2012/06/04 · arxiv created 2012/07/24 · arxiv updated 2012/07/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We calculate form-factor ratios between the semileptonic decays B⁰\ensuremath→D⁺\ensuremathℓ^\ensuremath-\ensuremathν and B_s⁰\ensuremath→D_s⁺\ensuremathℓ^\ensuremath-\ensuremathν with lattice QCD. These ratios are a key theoretical input in a new strategy to determine the fragmentation fractions of neutral B decays, which are needed for measurements of BR(B_s⁰\ensuremath→\ensuremathμ⁺\ensuremathμ^\ensuremath-). We use the MILC ensembles of gauge configurations with 2+1 flavors of sea-quarks at two s of approximately 0.12 fm and 0.09 fm. We use the model-independent z parametrization to extrapolate our simulation results at small recoil toward maximum recoil. Our results for the form-factor ratios are f₀^(s)(M_\ensuremathπ²)/f₀^(d)(M_K²)=1.046(44)_stat(15)_syst and f₀^(s)(M_\ensuremathπ²)/f₀^(d)(M_\ensuremathπ²)=1.054(47)_stat(17)_syst. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d\ensuremath↔s) symmetry is observed.

Citations

• Semileptonic D→π/K and B→π/D decays in 2+1 flavor lattice QCD
• Lattice QCD calculation ofB¯→Dlν¯decay form factors at zero recoil
• Measurement of|Vcb|and the Form-Factor Slope inB¯→Dℓ−ν¯ℓDecays in Events Tagged by a Fully ReconstructedBMeson
• Application of heavy-quark effective theory to lattice QCD: Power corrections
• Quenched lattice calculation of the B→Dℓν decay rate
• B→D*lνandB→Dlνform factors in staggered chiral perturbation theory
• Flavor-symmetry restoration and Symanzik improvement for staggered quarks
• Measurement of (→Dℓ) and determination of |V|
• Staggered chiral perturbation theory for heavy-light mesons
• B→πlνsemileptonic form factor from three-flavor lattice QCD: A model-independent determination of|Vub|
• Prediction of theBc*Mass in Full Lattice QCD
• Review of Particle Physics
• QCD factorization for exclusive non-leptonic B-meson decays: general arguments and the case of heavy–light final states

Cited by

• Implications of LHCb measurements and future prospects
• Measurement of the inclusive semileptonic branching fractionB(Bs0→X−ℓ+νℓ)at Belle