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The B*Bpi coupling using relativistic heavy quarks

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arxiv 1506.06413 v2 pith:V2H53MHV submitted 2015-06-21 hep-lat

J.M. Flynn , P. Fritzsch , T. Kawanai , C. Lehner , B. Samways , C.T. Sachrajda , R.S. Van de Water , O. Witzel (for the RBC/UKQCD Collaboration) This is my paper · ORCID
classification hep-lat
keywords calculationcouplingdirectlymassactionainverseb-quarkgauge
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We report on a calculation of the B*Bpi coupling in lattice QCD. The strong matrix element for a B* to Bpi transition is directly related to the leading order low-energy constant in heavy meson chiral perturbation theory (HMChPT) for B mesons. We carry out our calculation directly at the b-quark mass using a non-perturbatively 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 ainverse = 1.729(25) GeV, ainverse = 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 HMChPT coupling g_b = 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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Cited by 2 Pith papers

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  1. The $D^*D^*\pi$ and $B^*B^*\pi$ couplings from light-cone sum rules

    hep-ph 2026-08 conditional novelty 6.0 of 10

    A revised light-cone sum rule calculation yields g_{D*D*pi}=5.71 GeV^-1 and g_{B*B*pi}=4.90 GeV^-1, with a static coupling ĝ=0.30±0.04.

  2. $D^* D \pi$ and $B^* B \pi$ couplings from Dyson-Schwinger equations framework

    hep-ph 2024-11 conditional novelty 5.0 of 10

    A Dyson-Schwinger/Bethe-Salpeter calculation predicts g_D*Dpi = 16.22 and g_B*Bpi = 40.09, with static couplings consistent with lattice results.

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