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B*Bπ coupling using relativistic heavy quarks

B*Bπ coupling using relativistic heavy quarks
B*Bπ coupling using relativistic heavy quarks
We report on a calculation of the B* Bπ coupling in lattice QCD. The strong matrix element for a B* to Bπ transition is directly related to the leading order low-energy constant in heavy meson chiral perturbation theory (HMχPT) 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 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 HMχPT 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.
1550-7998
1-13
Flynn, Jonathan
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Fritzsch, Patrick
37d9095a-8c16-4087-8926-7d878ae83dd2
Kawanai, Taichi
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Lehner, Christoph
ca2f6986-c2ac-47b4-87fb-ac9351447244
Sachrajda, Christopher
0ed6568b-f52f-4314-8677-4aeeb925d6f7
Samways, Benjamin
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Van de Water, Ruth
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Witzel, Oliver
ceb5d2c8-8f0a-46f4-977e-7d45c6b06b82
Flynn, Jonathan
d8e90963-ba56-415c-bbd4-496b7d91d343
Fritzsch, Patrick
37d9095a-8c16-4087-8926-7d878ae83dd2
Kawanai, Taichi
d14cf626-23e4-44e1-83c6-b6de622fe889
Lehner, Christoph
ca2f6986-c2ac-47b4-87fb-ac9351447244
Sachrajda, Christopher
0ed6568b-f52f-4314-8677-4aeeb925d6f7
Samways, Benjamin
a32068b1-8b42-4234-af45-2176c0fb7bdb
Van de Water, Ruth
d0e7b560-861f-40d8-9762-4f5f0cea2057
Witzel, Oliver
ceb5d2c8-8f0a-46f4-977e-7d45c6b06b82

Flynn, Jonathan, Fritzsch, Patrick, Kawanai, Taichi, Lehner, Christoph, Sachrajda, Christopher, Samways, Benjamin, Van de Water, Ruth and Witzel, Oliver (2016) B*Bπ coupling using relativistic heavy quarks. Physical Review D, 93 (1), 1-13. (doi:10.1103/PhysRevD.93.014510).

Record type: Article

Abstract

We report on a calculation of the B* Bπ coupling in lattice QCD. The strong matrix element for a B* to Bπ transition is directly related to the leading order low-energy constant in heavy meson chiral perturbation theory (HMχPT) 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 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 HMχPT 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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Accepted/In Press date: 6 January 2016
e-pub ahead of print date: 27 January 2016
Published date: 27 January 2016
Organisations: Theoretical Partical Physics Group

Identifiers

Local EPrints ID: 397023
URI: https://eprints.soton.ac.uk/id/eprint/397023
ISSN: 1550-7998
PURE UUID: c0261d23-45ec-4bbb-93ae-fb7032bd2c89
ORCID for Jonathan Flynn: ORCID iD orcid.org/0000-0002-6280-1677

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Date deposited: 20 Jun 2016 11:05
Last modified: 31 Jul 2019 00:52

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Contributors

Author: Jonathan Flynn ORCID iD
Author: Patrick Fritzsch
Author: Taichi Kawanai
Author: Christoph Lehner
Author: Benjamin Samways
Author: Ruth Van de Water
Author: Oliver Witzel

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