B*Bπ coupling using relativistic heavy quarks

Flynn, J. M.; Fritzsch, P.; Kawanai, T.; Lehner, C.; Samways, B.; Sachrajda, C. T.; Van de Water, R. S.; Witzel, O.

doi:10.1103/PhysRevD.93.014510

Title: B*Bπ coupling using relativistic heavy quarks

Journal Article · Wed Jan 27 00:00:00 EST 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.014510· OSTI ID:1212686

Flynn, J. M. ^[1]; Fritzsch, P. ^[2]; Kawanai, T. ^[3]; Lehner, C. ^[3]; Samways, B. ^[1]; Sachrajda, C. T. ^[1]; Van de Water, R. S. ^[4]; Witzel, O. ^[5]

Univ. of Southampton, Southampton (United Kingdom)
Humboldt Univ., Berlin (Germany)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Boston Univ., Boston, MA (United States)

Here, we report on a calculation of the B*Bπ coupling in three-flavor lattice QCD. This coupling, defined from the strong-interaction matrix element , is related to the leading order low-energy constant in heavy meson chiral perturbation theory. We carry out our calculation directly at the b-quark mass using a nonperturbatively tuned clover action that controls discretization effects of order |$$\vec{p}$$a| and (ma)ⁿ for all n. Our analysis is performed on RBC/UKQCD gauge configurations using domain-wall fermions and the Iwasaki gauge action at two lattice spacings of a^-1=1.729(25) GeV, a^-1=2.281(28) GeV, and unitary pion masses down to 290 MeV. We achieve good statistical precision and control all systematic uncertainties, giving a final result for the coupling g_b=0.56(3)_stat(7)_sys in the continuum and at the physical light-quark masses. Moreover, this is the first calculation performed directly at the physical b-quark mass and lies in the region one would expect from carrying out an interpolation between previous results at the charm mass and at the static point.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: RBC and UKQCD Collaborations

Grant/Contract Number:: AC02-07CH11359; SC00112704

OSTI ID:: 1212686

Alternate ID(s):: OSTI ID: 1236284; OSTI ID: 1254819

Report Number(s):: FERMILAB-PUB-15-256-T; BNL-112233-2016-JA; PRVDAQ; arXiv eprint number arXiv:1506.06413

Journal Information:: Physical Review D, Vol. 93, Issue 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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QCD
coupling
quarks
lattice
flavour

Title: B*Bπ coupling using relativistic heavy quarks

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