B and D meson decay constants in lattice QCD

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.58.014506· OSTI ID:636218

El-Khadra, A X; Simone, J N ^[1]; Kronfeld, A S; Mackenzie, P B; Ryan, S M ^[2]

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1. Department of Physics, University of Illinois, Urbana, Illinois 61801 (United States)
2. Fermilab, P.O. Box 500, Batavia, Illinois 60510 (United States)

We have calculated the decay constants of B and D mesons with lattice QCD. We use an O(a)-improved action that takes light quark actions as a starting point, tuned so that it can be directly applied at the physical masses of the b and c quarks. Our results are f{sub B}=164{sub {minus}11}{sup +14}{plus_minus}8thinspMeV, f{sub B{sub s}}=185{sub {minus}8}{sup +13}{plus_minus}9thinspMeV, f{sub D}=194{sub {minus}10}{sup +14}{plus_minus}10thinspMeV, and f{sub D{sub s}}=213{sub {minus}11}{sup +14}{plus_minus}11thinspMeV in the quenched approximation. The first error in each case is statistical, and the second is from perturbation theory. We show that discretization errors are under control in our approach and smaller than our statistical errors. The effects of the quenched approximation may raise our quenched result by up to 10{percent}. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 636218
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 58; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
B MESONS
B QUARKS
C QUARKS
D MESONS
KOBAYASHI-MASKAWA MATRIX
LATTICE FIELD THEORY
MASS
PARTICLE DECAY
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS