Application of the light-front holographic wavefunction for heavy-light pseudoscalar meson in B-d,B-s -> D-d,D-s P decays
Application of the light-front holographic wavefunction for heavy-light pseudoscalar meson in B-d,B-s -> D-d,D-s P decays
复制标题
重光赝标量介子光前全息波函数在B-d,B-s→D-d,D-s P衰变中的应用
DOI：
10.1016/j.nuclphysb.2017.06.002
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发表时间：
2017
影响因子：
2.8
通讯作者：
Chen Lingxin
中科院分区：
文献类型：
--
作者：
Chang Qin;Xu Shuai;Chen Lingxin
本文将改进的全息波函数对衰变常数和分布振幅的分析推广到了重轻赝标介子。在计算中，考虑了全息波函数的螺旋度依赖性，并采用了一个独立的质量尺度参数来缓和重夸克引起的强抑制。在赝标介子衰变常数和质量的约束下，全息参量的χ 2分析与Regge轨迹拟合的结果基本一致.利用拟合的参数，给出了衰减常数和分布振幅的计算结果。然后，我们展示了它们在计算B d，s→ D d，s P衰变中的应用，其中首先估计了功率抑制的旁观者散射和弱湮灭修正。在数值上，旁观者散射和弱湮灭修正对分支分数产生了约0.7%的负移，但预测值仍大于实验值。这种小的负偏移证实了基于功率计数规则的估计。
In this paper we extend our analyses of the decay constant and distribution amplitude with an improved holographic wavefunction to the heavy-light pseudoscalar mesons. In the evaluations, the helicity-dependence of the holographic wavefunction is considered; and an independent mass scale parameter is employed to moderate the strong suppression induced by the heavy quark. Under the constraints from decay constants and masses of pseudoscalar mesons, the χ 2-analyses for the holographic parameters exhibit a rough consistence with the results obtained by fitting the Regge trajectory. With the fitted parameters, the results for the decay constants and distribution amplitudes are presented. We then show their application in evaluating the B d, s→ D d, s P decays, in which the power-suppressed spectator scattering and weak annihilation corrections are first estimated. Numerically, the spectator scattering and weak annihilation corrections present a negative shift of about 0.7% on the branching fractions; while, the predictions are still larger than the experimental data. Such small negative shift confirms the estimation based on the power counting rules.