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arXiv 0704.0016hep-ph
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双粲重子的寿命

Lifetime of doubly charmed baryons

Chao-Hsi Chang, Tong Li, Xue-Qian Li, Yu-Ming Wang

摘要:

本文计算了双粲重子$Ξ_{cc}^{+}$、$Ξ_{cc}^{++}$和$Ω_{cc}^{+}$的寿命。我们仔细地计算了非旁观者的贡献,在夸克水平的Cabibbo抑制图也包括在内。在简单的非相对论谐振子模型中计算了强子矩阵元。我们的数值结果与其他作者用双夸克模型得到的结果基本一致。然而,所有的理论预测的寿命都是一个数量级以上的上限所设定的最近的SELEX测量。这种差异将在未来的实验中得到澄清,如果更精确的实验仍然证实了SELEX合作的价值,那么一定有一些未知的机制需要探索。

英文摘要:

In this work, we evaluate the lifetimes of the doubly charmed baryons $Ξ_{cc}^{+}$, $Ξ_{cc}^{++}$ and $Ω_{cc}^{+}$. We carefully calculate the non-spectator contributions at the quark level where the Cabibbo-suppressed diagrams are also included. The hadronic matrix elements are evaluated in the simple non-relativistic harmonic oscillator model. Our numerical results are generally consistent with that obtained by other authors who used the diquark model. However, all the theoretical predictions on the lifetimes are one order larger than the upper limit set by the recent SELEX measurement. This discrepancy would be clarified by the future experiment, if more accurate experiment still confirms the value of the SELEX collaboration, there must be some unknown mechanism to be explored.

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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