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arXiv 2103.08586hep-ph
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B衰变中的强子分子

Hadronic molecules in B decays

Hua-Xing Chen

摘要:

有18种可能存在的$D^{(*)} \bar D^{(*)}$、$D^{(*)} \bar K^{(*)}$和$D^{(*)} D_s^{(*)-}$强子分子态。构造了相应的内插流,并利用QCD求和规则计算了它们的质量和衰变常数。基于这些结果,我们通过当前代数计算了它们在$B$和$B^*$衰变中的相对产生率,并通过Fierz重排计算了它们的相对分支比,如表III所示。我们的结果支持的解释$X(3872)$,$Z_c(3900)$,$Z_c(4020)$,和$X_0(2900)$的分子状态$D \bar D^*$的$J^{PC} = 1^{++}$,$D \bar D^*$的$J^{PC} = 1^{+-}$,$D^* \bar D^*$的$J^{PC} = 1^{+-}$,和$D^* \bar K^*$的$J^P = 0^{+}$,分别。我们的研究结果还表明,$Z_{cs}(3985)$,$Z_{cs}(4000)$和$Z_{cs}(4220)$是奇怪的伙伴,$X(3872)$,$Z_c(3900)$和$Z_c(4020)$,分别。在计算中,我们估计弱耦合复合粒子$A = |BC\rangle$的寿命为$1/t_A \approx 1/t_B + 1/t_C + Γ_{A \to BC} + \cdots$,$\cdots$部分宽度的其他可能的衰变通道。

英文摘要:

There are eighteen possibly existing $D^{(*)} \bar D^{(*)}$, $D^{(*)} \bar K^{(*)}$, and $D^{(*)} D_s^{(*)-}$ hadronic molecular states. We construct their corresponding interpolating currents, and calculate their masses and decay constants using QCD sum rules. Based on these results, we calculate their relative production rates in $B$ and $B^*$ decays through the current algebra, and calculate their relative branching ratios through the Fierz rearrangement, as summarized in Table III. Our results support the interpretations of the $X(3872)$, $Z_c(3900)$, $Z_c(4020)$, and $X_0(2900)$ as the molecular states $D \bar D^*$ of $J^{PC} = 1^{++}$, $D \bar D^*$ of $J^{PC} = 1^{+-}$, $D^* \bar D^*$ of $J^{PC} = 1^{+-}$, and $D^* \bar K^*$ of $J^P = 0^{+}$, respectively. Our results also suggest that the $Z_{cs}(3985)$, $Z_{cs}(4000)$, and $Z_{cs}(4220)$ are strange partners of the $X(3872)$, $Z_c(3900)$, and $Z_c(4020)$, respectively. In the calculations we estimate the lifetime of a weakly-coupled composite particle $A = |BC\rangle$ to be $1/t_A \approx 1/t_B + 1/t_C + Γ_{A \to BC} + \cdots$, with $\cdots$ partial widths of other possible decay channels.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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