-meson decay constants from -flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks
- Columbia Univ., New York, NY (United States)
- Univ. of Southampton, Southampton (United Kingdom)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- RIKEN, Wako (Japan); Brookhaven National Lab. (BNL), Upton, NY (United States)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Boston Univ., Boston, MA (United States)
We calculate the B-meson decay constants fB, fBs, and their ratio in unquenched lattice QCD using domain-wall light quarks and relativistic b quarks. We use gauge-field ensembles generated by the RBC and UKQCD collaborations using the domain-wall fermion action and Iwasaki gauge action with three flavors of light dynamical quarks. We analyze data at two lattice spacings of a ≈ 0.11, 0.086 fm with unitary pion masses as light as Mπ ≈ 290 MeV; this enables us to control the extrapolation to the physical light-quark masses and continuum. For the b quarks we use the anisotropic clover action with the relativistic heavy-quark interpretation, such that discretization errors from the heavy-quark action are of the same size as from the light-quark sector. We renormalize the lattice heavy-light axial-vector current using a mostly nonperturbative method in which we compute the bulk of the matching factor nonperturbatively, with a small correction, that is close to unity, in lattice perturbation theory. We also improve the lattice heavy-light current through O(αsa). We extrapolate our results to the physical light-quark masses and continuum using SU(2) heavy-meson chiral perturbation theory, and provide a complete systematic error budget. We obtain fB0 = 199.5(12.6) MeV, fB+=195.6(14.9) MeV, fBs=235.4(12.2) MeV, fBs/fB0=1.197(50), and fBs/fB+=1.223(71), where the errors are statistical and total systematic added in quadrature. Finally, these results are in good agreement with other published results and provide an important independent cross-check of other three-flavor determinations of B-meson decay constants using staggered light quarks.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- RBC and UKQCD Collaborations
- Grant/Contract Number:
- AC02-07CH11359; FG02-92ER40699; SC0008814
- OSTI ID:
- 1289771
- Alternate ID(s):
- OSTI ID: 1181051
- Report Number(s):
- FERMILAB-PUB-14-100-T; arXiv:1404.4670; PRVDAQ; 1291284
- Journal Information:
- Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 91, Issue 5; ISSN 1550-7998
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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