Quenched heavy-light decay constants

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.1594· OSTI ID:5340311

Baxter, R M; Booth, S P; Bowler, K C; Collins, S; Henty, D S; Kenway, R D; Richards, D G; Shanahan, H P; Simone, J N; Simpson, A D; Wilkes, B E ^[1]; Ewing, A K; Lellouch, L; Sachrajda, C T; Wittig, H ^[2]

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1. Department of Physics, The University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
2. Physics Department, The University, Southampton SO9 5NH (United Kingdom)

We present results for heavy-light decay constants, using both propagating quarks and the static approximation, in [ital O]([ital a])-improved, quenched lattice QCD. At [beta]=6.2 on a 24[sup 3][times]48 lattice we find [ital f][sub [ital D]]=185[sub [minus]3][sup +4](stat) [sub [minus]7][sup +42](syst) MeV, [ital f][sub [ital B]]=160[sub [minus]6[minus]19][sup +6+53] MeV, [ital f][sub [ital D][ital s]]/[ital f][sub [ital D]]=1.18[sub [minus]2][sup +2], and [ital f][sub [ital B][ital s]]/[ital f][sub [ital B]]=1.22[sub [minus]3][sup +4], in good agreement with earlier studies. From the static theory we obtain [ital f][sub [ital B]][sup stat]=253[sub [minus]15][sup +16] [sub [minus]15][sup +105] MeV. We also present results from a simulation at [beta]=6.0 on a 16[sup 3][times]48 lattice, which are consistent with those at [beta]=6.2. In order to study the effects of improvement, we present a direct comparison of the results using both the Wilson and the improved action at [beta]=6.0.

• OSTI ID: 5340311
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 49:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
CP INVARIANCE
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
LATTICE FIELD THEORY
LEPTONIC DECAY
MESONS
PARTICLE DECAY
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
SIMULATION
WEAK INTERACTIONS
WEAK PARTICLE DECAY