B_c介子到B_sπ、DKπ和D_sKK末态介子衰变的振幅分析与分支比计算
Amplitude analysis and branching fraction calculations of $B_c$ meson decays into $B_sπ$, $DKπ$ and $D_sKK$ final state mesons
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中文总结 AI 辅助
本研究针对B_c^+介子的三种新观测衰变道，采用因子化方法计算其分支比，结果与LHCb实验值吻合，验证了因子化形式的有效性。
中文摘要 AI 辅助
本研究针对B_c^+介子的几种新观测到的衰变模式展开研究，这些衰变模式形式为B_c^+→Dh^+h^-，其中D表示粲介子，h^±代表带电π介子或K介子。首次观测到的衰变道包括B_c^+→D^+K^+π^-、B_c^+→D^{*+}K^+π^-和B_c^+→D_s^+K^+K^-。LHCb合作组已测量这些衰变相对于参考衰变B_c^+→B_s^0π^+的分支比，给出的实验值为：ℛ^exp(B_c^+→D^+K^+π^-)=(1.96±0.23±0.08±0.10)×10^-3，ℛ^exp(B_c^+→D^{*+}K^+π^-)=(3.67±0.55±0.24±0.20)×10^-3，ℛ^exp(B_c^+→D_s^+K^+K^-)=(1.61±0.35±0.13±0.07)×10^-3。针对上述情况，本研究通过因子化方法进行精确计算，得到了对应的分支比理论值：ℛ(B_c^+→D^+K^+π^-)=(1.70±0.08)×10^-3，ℛ(B_c^+→D^{*+}K^+π^-)=(3.63±0.45)×10^-3，ℛ(B_c^+→D_s^+K^+K^-)=(1.09±0.08)×10^-3。所得理论结果与LHCb合作组近期的实验测量值吻合良好，证实了因子化形式在描述这类B_c^+衰变模式时的有效性。
英文摘要
In this study, several newly observed decay modes of the $B_c^+$ meson of the form $B_c^+\rightarrow Dh^+h^-$, where $D$ denotes a charmed meson and $h^{\pm}$ represents a charged pion or kaon, have been investigated. The decay channels $B_c^+\rightarrow D^{+}K^+π^{-}$, $B_c^+\rightarrow D^{*+}K^+π^{-}$ and $B_c^+\rightarrow D_s^+K^+K^-$ were observed for the first time. The LHCb Collaboration has measured their branching fractions relative to the reference decay $B_c^+\rightarrow B_s^0π^+$, and reported experimental values including $\mathcal{R}^{\exp}(B_c^+\rightarrow D^{+}K^+π^{-})=(1.96\pm0.23\pm0.08\pm0.10)\times 10^{-3}$ , $\mathcal{R}^{\exp}(B_c^+\rightarrow D^{*+}K^+π^{-})=(3.67\pm0.55\pm0.24\pm0.20)\times10^{-3}$ and $\mathcal{R}^{\exp}(B_c^+\rightarrow D_s^+K^+K^{-})=(1.61\pm0.35\pm0.13\pm0.07)\times 10^{-3}$. In this regard, by performing precise calculations using the factorization approach, we have computed similar branching ratio values, including $\mathcal{R}(B_c^+\rightarrow D^{+}K^+π^{-})=(1.70\pm0.08)\times 10^{-3}$, $\mathcal{R}(B_c^+\rightarrow D^{*+}K^+π^{-})=(3.63\pm0.45)\times 10^{-3}$ and $\mathcal{R}(B_c^+\rightarrow D_s^+K^+K^{-})=(1.09\pm0.08)\times 10^{-3}$. The obtained theoretical results show good consistency with the recent experimental measurements reported by the LHCb collaboration, confirming the effectiveness of the factorization formalism in describing these $B_c^+$ decay modes.
