EvtGen程序包中用于分析Bc -> J/psi +n π和Bc -> B_s +n π衰变的BC_NPI模块
BC_NPI module for the analysis of Bc -> J/psi +n pi and Bc -> B_s +n pi decays within the EvtGen package
摘要：
在EvtGen程序包中实现了产生$B_c$介子衰变为$J/ψ+ nπ$和$B_s^{(*)} + nπ$（$n\le 4$）的模块。在因子分解模型的框架下计算了衰变振幅。在这种方法中，衰变可以表示为$B_c$衰变为$J/ψ(B_s)+W^*$，随后是虚拟的$W^*$ -玻色子衰变为最终的$π$ -介子。所描述的计算技术允许采用从$τ$衰变到$ν_τ+nπ$的分析的$W^*\to nπ$跃迁的参数。与现有的理论预测进行比较。
英文摘要：
The module for the generation of $B_c$ meson decays into $J/ψ+ nπ$ and $B_s^{(*)} + nπ$ ($n\le 4$) is implemented into EvtGen program package. The decay amplitudes are calculated in the frame work of factorization model. Within this approach the decay can be represented as $B_c$ decay into $J/ψ(B_s)+W^*$ followed by the virtual $W^*$-boson decay into the final set of $π$-mesons. The described calculation technique allows to adopt the parameters of $W^*\to nπ$ transition from the analysis of $τ$ decay into $ν_τ+nπ$. Comparison with available theoretical predictions is performed.
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