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A lattice measurement of the B*B? coupling using DWF light quarks and the Relativistic Heavy Quark action

A lattice measurement of the B*B? coupling using DWF light quarks and the Relativistic Heavy Quark action
A lattice measurement of the B*B? coupling using DWF light quarks and the Relativistic Heavy Quark action
I describe a calculation of the B*B? coupling in lattice QCD. The B*B? coupling is directly related to gb, the leading order low-energy interaction constant of heavy meson chiral perturbation theory. Knowledge of the coupling will help decrease systematic uncertainties in lattice QCD B-physics studies, which are important to constrain the CKM matrix and probe the Standard Model. This calculation is performed with 2+1 flavours of dynamic quarks using the domain wall fermion action. To simulate the heavy b-quark I use a non-perturbatively tuned relativistic heavy quark action which keeps discretisation effects under good control. This allows me to make the first calculation of the
B*B? coupling directly at the physical b-quark mass. I conduct a chiral and continuum extrapolation to the physical point and consider all sources of systematic error. The final result including both statistical and sytematic errors is gb = 0.567(52)stat(58)sys.
Samways, Benjamin
a32068b1-8b42-4234-af45-2176c0fb7bdb
Samways, Benjamin
a32068b1-8b42-4234-af45-2176c0fb7bdb
Flynn, Jonathan
d8e90963-ba56-415c-bbd4-496b7d91d343

(2013) A lattice measurement of the B*B? coupling using DWF light quarks and the Relativistic Heavy Quark action. University of Southampton, Physical Sciences and Engineering, Doctoral Thesis, 110pp.

Record type: Thesis (Doctoral)

Abstract

I describe a calculation of the B*B? coupling in lattice QCD. The B*B? coupling is directly related to gb, the leading order low-energy interaction constant of heavy meson chiral perturbation theory. Knowledge of the coupling will help decrease systematic uncertainties in lattice QCD B-physics studies, which are important to constrain the CKM matrix and probe the Standard Model. This calculation is performed with 2+1 flavours of dynamic quarks using the domain wall fermion action. To simulate the heavy b-quark I use a non-perturbatively tuned relativistic heavy quark action which keeps discretisation effects under good control. This allows me to make the first calculation of the
B*B? coupling directly at the physical b-quark mass. I conduct a chiral and continuum extrapolation to the physical point and consider all sources of systematic error. The final result including both statistical and sytematic errors is gb = 0.567(52)stat(58)sys.

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Published date: November 2013
Organisations: University of Southampton, Physics & Astronomy

Identifiers

Local EPrints ID: 361526
URI: http://eprints.soton.ac.uk/id/eprint/361526
PURE UUID: 68f9bcbb-1a1a-4ba3-8eea-36dfccff8e38
ORCID for Jonathan Flynn: ORCID iD orcid.org/0000-0002-6280-1677

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Date deposited: 27 Jan 2014 10:33
Last modified: 06 Jun 2018 13:09

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Contributors

Author: Benjamin Samways
Thesis advisor: Jonathan Flynn ORCID iD

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