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19 April 2024 |
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Article overview
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The B*Bpi coupling using relativistic heavy quarks | | J.M. Flynn
; P. Fritzsch
; T. Kawanai
; C. Lehner
; B. Samways
; C.T. Sachrajda
; R.S. Van de Water
; O. Witzel
; RBC/UKQCD Collaboration
; | | Date: |
21 Jun 2015 | | Abstract: | 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. | | Source: | arXiv, 1506.6413 | | Services: | Forum | Review | PDF | Favorites | |
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