Journal Article

FZJ-2017-00836

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png B * B π coupling using relativistic heavy quarks

Flynn, J. M. ; Fritzsch, P. (Corresponding author) ; Kawanai, T.FZJ* ; Lehner, C. ; Sachrajda, C. T. ; Samways, B. ; Van de Water, R. S. ; Witzel, O.

2016
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/13566  doi:10.1103/PhysRevD.93.014510

Abstract: We report on a calculation of the B∗Bπ coupling in three-flavor lattice QCD. This coupling, defined from the strong-interaction matrix element ⟨Bπ|B∗⟩, 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 |⃗pa| 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 gb=0.56(3)stat(7)sys in the continuum and at the physical light-quark masses. 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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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)

Appears in the scientific report 2016

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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