FORM-FACTORS FOR B-]PI-L(V)OVER-BAR(L) AND B-]K-ASTERISK-GAMMA DECAYS ON THE LATTICE

被引:72
作者
BURFORD, DR
DUONG, HD
FLYNN, JM
GOUGH, BJ
HAZEL, NM
NIEVES, J
SHANAHAN, HP
机构
[1] FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510
[2] UNIV EDINBURGH,DEPT PHYS & ASTRON,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND
[3] UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,LANARK,SCOTLAND
关键词
D O I
10.1016/0550-3213(95)00223-F
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We present a unified method for analysing form factors in B --> pi l ($) over bar nu(l) and B --> K*gamma decays. The analysis provides consistency checks on the q(2) and 1/M extrapolations necessary to obtain the physical decay rates. For the first time the q(2) dependence of the form factors is obtained at the B scale. In the B --> pi l ($) over bar nu(l) case, we show that pole fits to f(+) may not be consistent with the q(2) behaviour of f(0), leading to a possible factor of two uncertainty in the decay rate and hence in the value of /V-ub/(2) deduced from it. For B --> K*gamma, from the combined analysis of form factors T-1 and T-2, we find the hadronisation ratio R(K)* of the exclusive B --> K*gamma to the inclusive b --> s gamma rates is of order 35% or 15% for constant and pole-type behaviour of T-2, respectively.
引用
收藏
页码:425 / 437
页数:13
相关论文
共 26 条
[21]   DETERMINATION OF VERTICAL-BAR-V-TS-VERTICAL-BAR FROM D-]K-ASTERISK-L-NU AND B-]K-ASTERISK-GAMMA DATA VIA HEAVY-QUARK SYMMETRY AND PERTURBATIVE QCD [J].
GRIFFIN, PA ;
MASIP, M ;
MCGUIGAN, M .
PHYSICAL REVIEW D, 1994, 50 (09) :5751-5761
[22]  
GUPTA RK, COMMUNICATION
[23]   THE IMPROVEMENT OF HADRONIC MATRIX-ELEMENTS IN LATTICE QCD [J].
HEATLIE, G ;
SACHRAJDA, CT ;
MARTINELLI, G ;
PITTORI, C ;
ROSSI, GC .
NUCLEAR PHYSICS B, 1991, 352 (01) :266-288
[24]   RELATIONSHIP BETWEEN FORM-FACTORS IN SEMILEPTONIC BBAR AND D DECAYS AND EXCLUSIVE RARE BBAR-MESON DECAYS [J].
ISGUR, N ;
WISE, MB .
PHYSICAL REVIEW D, 1990, 42 (07) :2388-2391
[25]  
LELLOUCH L, UNPUB
[26]   SEMILEPTONIC DECAYS OF D-MESONS IN LATTICE QCD [J].
LUBICZ, V ;
MARTINELLI, G ;
MCCARTHY, MS ;
SACHRAJDA, CT .
PHYSICS LETTERS B, 1992, 274 (3-4) :415-420