BOWLER, K C , HAZEL, N M , HENTY, D S , HOEBER, H , KENWAY, R D , RICHARDS, D G , SHANAHAN, H P , SIMONE, J N , FLYNN, J M and GOUGH, B J (1994) Lattice calculation of the penguin diagram decay B→K*γ. Physical Review Letters, 72 (10).
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We calculate the leading-order matrix element for the decay B --> K gamma in the quenched approximation of lattice QCD on a 24(3) x 48 lattice at beta = 6.2, using an O(a)-improved fermion action. Extrapolating to physical quark masses gives an on-shell form factor of T1(q2=0) = 0.15(-14)+12 (stat). We find T1 is approximately independent of the spectator quark mass and extract T1(q2=0) = 0.15(-4)+5 if this independence is assumed. We find the results to be consistent (in the standard model) with the CLEO experimental branching ratio of B(B --> K*-gamma) = (4.5 +/- 1.5 +/-0.9) x 10(-5).
This is a Submitted version This version's date is: 7/3/1994 This item is not peer reviewed
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