LATTICE CALCULATION OF THE PENGUIN DIAGRAM DECAY B-]K-ASTERISK-GAMMA

被引：29

作者：

BOWLER, KC ^{[1
]}

HAZEL, NM ^{[1
]}

HENTY, DS ^{[1
]}

HOEBER, H ^{[1
]}

KENWAY, RD ^{[1
]}

RICHARDS, DG ^{[1
]}

SHANAHAN, HP ^{[1
]}

SIMONE, JN ^{[1
]}

FLYNN, JM ^{[1
]}

GOUGH, BJ ^{[1
]}

机构：

[1] UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 72卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.72.1398

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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).

引用

页码：1398 / 1401

页数：4

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