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Lattice calculation of the penguin diagram decay [ital B][r arrow][ital K][sup *][gamma]

Journal Article · · Physical Review Letters; (United States)
; ; ; ; ; ; ;  [1]; ;  [2]
  1. Department of Physics, The University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
  2. Department of Physics, The University, Southampton SO9 5NH (United Kingdom)
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We calculate the leading-order matrix element for the decay [ital B][r arrow][ital K][sup *][gamma] in the quenched approximation of lattice QCD on a 24[sup 3][times]48 lattice at [beta]=6.2, using an [ital O]([ital a])-improved fermion action. Extrapolating to physical quark masses gives an on-shell form factor of [ital T][sub 1]([ital q][sup 2]=0)=0.15[sub [minus]14][sup +12] (stat). We find [ital T][sub 1] is approximately independent of the spectator quark mass and extract [ital T][sub 1]([ital q][sup 2]=0)=0.15[sub [minus]4][sup +5] if this independence is assumed. We find the results to be consistent (in the standard model) with the CLEO experimental branching ratio of [ital B]([ital B][r arrow][ital K][sup *][gamma])=(4.5[plus minus]1.5[plus minus]0.9)[times]10[sup [minus]5].

OSTI ID:
5015404
Journal Information:
Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:10; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

662230* -- Quantum Chromodynamics-- (1992-)
662390 -- Electromagnetic Processes & Properties-- (1992-)
662420 -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
BEAUTY PARTICLES
BOSONS
BRANCHING RATIO
DECAY
ELEMENTARY PARTICLES
FIELD THEORIES
FORM FACTORS
HADRONS
LATTICE FIELD THEORY
MATRIX ELEMENTS
MESONS
PARTICLE DECAY
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
RADIATIVE DECAY
STRANGE MESONS
STRANGE PARTICLES