Computation of the heavy-light decay constant using nonrelativistic lattice QCD

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.4639· OSTI ID:7224648

Hashimoto, S ^[1]

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1. Department of Physics, Hiroshima University, Higashi-Hiroshima, Hiroshima 724 (Japan)

We report results on a lattice calculation of the heavy-light meson decay constant employing the nonrelativistic QCD approach for heavy quarks and the Wilson action for light quarks. Simulations are carried out at [beta]=6.0 on a 16[times]48 lattice. The signal to noise ratio for the ground state is significantly improved compared to simulations in the static approximation, enabling us to extract the decay constant reliably. We compute the heavy-light decay constant for several values of heavy quark mas and estimate the magntiude of the deviation from the heavy mass scaling law [ital f][sub [ital P]] [radical][ital m][sub [ital P]] =const. For the [ital B] meson we find [ital f][sub [ital B]]=171[plus minus]22[sub [minus]45][sup +19] MeV, while an extrapolation to the static limit yields [ital f][sub [ital B]][sup static]=297[plus minus]36[sub [minus]30][sup +15] MeV.

• OSTI ID: 7224648
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:7; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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662240 -- Models for Strong Interactions-- (1992-)
662420 -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
DECAY
ELEMENTARY PARTICLES
ENERGY LEVELS
EXTRAPOLATION
FERMIONS
FIELD THEORIES
GROUND STATES
HADRONS
MESONS
NUMERICAL SOLUTION
PARTICLE DECAY
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
SCALING
SIMULATION