Heavy-light mesons with quenched lattice NRQCD: Results on decay constants

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.7012· OSTI ID:553166

Khan, A A; Shigemitsu, J ^[1]; Collins, S; Davies, C T ^[2]; Morningstar, C ^[3]; Sloan, J ^[4]

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1. The Ohio State University, Columbus, Ohio 43210-1106 (United States)
2. University of Glasgow, Glasgow G12 8QQ (United Kingdom)
3. University of California at San Diego, La Jolla, California 92093-0319 (United States)
4. University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

We present a quenched lattice calculation of heavy-light meson decay constants, using nonrelativistic (NRQCD) heavy quarks in the mass region of the b quark and heavier, and clover-improved light quarks. The NRQCD Hamiltonian and the heavy-light current include the corrections at first order in the expansion in the inverse heavy quark mass. We study the dependence of the decay constants on the heavy meson mass M, for light quarks with the tree level (c{sub SW}=1), as well as the tadpole-improved clover coefficient. We compare decay constants from NRQCD with results from clover (c{sub SW}=1) heavy quarks. Having calculated the current renormalization constant Z{sub A} in one-loop perturbation theory, we demonstrate how the heavy mass dependence of the pseudoscalar decay constant changes after renormalization. We quote a result for f{sub B} from NRQCD including the full one-loop matching factors at O({alpha}/M). {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 553166
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 11 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
B QUARKS
LATTICE FIELD THEORY
MASS
MESONS
PARTICLE DECAY
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
RENORMALIZATION