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 , GOUGH, B J , ALLTON, C , LELLOUCH, L , NIEVES, J and WITTIG, H (1995) Lattice calculation of the branching ratio for some of the exclusive modes of B-]S-gamma. Physical Review D , 51 (9).
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We calculate the leading-order matrix element for exclusive decays of b→sγ in the quenched approximation of lattice QCD on a 243×48 lattice at β=6.2, using an O(a)-improved fermion action. The matrix element is used to extract the on-shell form factor T1(q2=0) for B→K*γ and Bs→φγ, using two different assumptions about the q2 dependence of the form factors for these decays. For B→K*γ, T1(q2=0) is determined to be 0.159-33+34±0.067 or 0.124-18+20±0.022 in the two cases. We find the results to be consistent (in the standard model) with the CLEO experimental branching ratio of B(B→K*γ)=(4.5±1.5±0.9)×10-5.
This is a Submitted version This version's date is: 1/5/1995 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/5757a663-8e73-f01f-fc6e-597f487d4169/6/
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