Determination of B*B{pi} coupling in unquenched lattice QCD

Journal Article · Thu May 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.094509· OSTI ID:21250139

Ohki, Hiroshi ^[1]; Matsufuru, Hideo ^[2]; Onogi, Tetsuya ^[1]

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1. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
2. High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801 (Japan)

The B*B{pi} coupling is a fundamental parameter of chiral effective Lagrangian with heavy-light mesons and can constrain the chiral behavior of f{sub B}, B{sub B}, and the B{yields}{pi}l{nu} form factor in the soft pion limit. We compute the B*B{pi} coupling with the static heavy quark and the O(a)-improved Wilson light quark. Simulations are carried out with n{sub f}=2 unquenched 12{sup 3}x24 lattices at {beta}=1.80 and 16{sup 3}x32 lattices at {beta}=1.95 generated by the CP-PACS collaboration. To improve the statistical accuracy, we employ the all-to-all propagator technique and the static quark action with smeared temporal link variables. These methods successfully work also on unquenched lattices, and determine the B*B{pi} coupling with 1%-2% statistical accuracy on each lattice spacing.

• OSTI ID: 21250139
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
CHIRALITY
COUPLING
FORM FACTORS
LAGRANGIAN FUNCTION
LATTICE FIELD THEORY
MESONS
PERTURBED ANGULAR CORRELATION
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
SIMULATION
STATISTICAL MODELS