Radiative and semileptonic B decays involving higher K-resonances in the final states

被引:22
作者
Hatanaka, Hisaki [1 ]
Yang, Kwei-Chou [1 ]
机构
[1] Chung Yuan Christian Univ, Dept Phys, Chungli 320, Taiwan
来源
EUROPEAN PHYSICAL JOURNAL C | 2010年 / 67卷 / 1-2期
关键词
FORWARD-BACKWARD ASYMMETRY; BRANCHING FRACTIONS; ART; SEARCH; GAMMA; QCD;
D O I
10.1140/epjc/s10052-010-1293-7
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 study the radiative and semileptonic B decays involving a spin-J resonant K-J(()*()) with parity (-1)(J) for K-J* and (-1)(J+1) for K-J in the final state. Using large energy effective theory (LEET) techniques, we formulate B -> K-J(()*()) transition form factors in the large recoil region in terms of two independent LEET functions zeta(KJ()(perpendicular to)*()) and zeta(KJ()(parallel to)*()), the values of which at zero momentum transfer are estimated in the BSW model. According to the QCD counting rules, zeta(KJ()(perpendicular to,parallel to)*()) exhibit a dipole dependence in q(2). We predict the decay rates for B -> K-J(()*())gamma, B -> K-J(()*())l(+)l(-) and B -> K-J(()*()) nu(nu) over bar. The branching fractions for these decays with higher K-resonances in the final state are suppressed due to the smaller phase spaces and the smaller values of zeta(KJ()(perpendicular to,parallel to)*()). Furthermore, if the spin of K-J(()*()) becomes larger, the branching fractions will be further suppressed due to the smaller Clebsch-Gordan coefficients defined by the polarization tensors of the K-J(()*()). We also calculate the forward-backward asymmetry of the B -> K-J(()*())l(+)l(-) decay, for which the zero is highly insensitive to the K-resonances in the LEET parametrization.
引用
收藏
页码:149 / 162
页数:14
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