Semileptonic and nonleptonic decays of B c mesons to orbitally excited heavy mesons in the relativistic quark model
Semileptonic and nonleptonic decays of B c mesons to orbitally excited heavy mesons in the relativistic quark model
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DOI：
10.1103/physrevd.82.034019
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发表时间：
2010-07
影响因子：
5
通讯作者：
D. Ebert;R. Faustov;R. Faustov;V. Galkin;V. Galkin
中科院分区：
文献类型：
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作者：
D. Ebert;R. Faustov;R. Faustov;V. Galkin;V. Galkin
在QCD激发的相对论夸克模型框架下，基于准势方法计算了${B}{c}$介子到轨道激发的粲偶素、$D$、${B}{s}$和$B$介子弱衰变的形状因子.系统地考虑了相对论效应。在整个运动学范围内可靠地确定了形状因子对动量传递的依赖性。形状因子通过介子波函数的重叠积分表示，这是已知的，从以前的质谱计算在同一模型内。在此基础上，计算了半轻子和非轻子${B}_{c}$到轨道激发态重介子的衰变率。给出了${B}_{c}$衰变到轨道和径向激发的$2 P $和$3 S $粲偶素态的预言，这些预言可用于澄清最近观察到的高于开粲产生阈值的类粲偶素态的性质.
The form factors of weak decays of the ${B}_{c}$ meson to orbitally excited charmonium, $D$, ${B}_{s}$, and $B$ mesons are calculated in the framework of the QCD-motivated relativistic quark model based on the quasipotential approach. Relativistic effects are systematically taken into account. The form factor dependence on the momentum transfer is reliably determined in the whole kinematical range. The form factors are expressed through the overlap integrals of the meson wave functions, which are known from the previous mass spectra calculations within the same model. On this basis, semileptonic and nonleptonic ${B}_{c}$ decay rates to orbitally excited heavy mesons are calculated. Predictions for the ${B}_{c}$ decays to the orbitally and radially excited $2P$ and $3S$ charmonium states are given, which could be used for clarifying the nature of the recently observed charmoniumlike states above the open charm production threshold.