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arXiv 1102.5648hep-phhep-ex
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在SM及更高浓度下$ψ(2S)$至$Λ_c+\bar{Σ^+}$的衰减率

The decay rate of $ψ(2S)$ to $Λ_c+\bar{Σ^+}$ in SM and beyond

Hong-Wei Ke, Ya-Zheng Chen, Xue-Qian Li

摘要:

随着BES III数据库的快速增长和超级味工厂的提出,对稀有$ψ(2S)$衰变,特别是弱衰变到重子末态的测量可能成为可能。在这项工作中,我们研究的衰变率$ψ(2S)$ $Λ_c+\overline{Σ^+}$在SM和超越SM的物理(这里我们使用的非粒子模型作为一个例子)。用QPC模型描述了真空中产生一对$q\bar q$的过程。我们发现,在SM中,$ψ(2S)\rightarrow Λ_c+\overline{Σ^+}$的贡献率约为$10^{-10}$,而非粒子的贡献很小,并不显著.因此,如果观察到一个大的分支比,它一定是由于新的物理超越SM,但绝不是非粒子。

英文摘要:

With rapid growth of the database of the BES III and the proposed super flavor factory, measurement on the rare $ψ(2S)$ decays may be feasible, especially the weak decays into baryon final states. In this work we study the decay rate of $ψ(2S)$ to $Λ_c+\overline{Σ^+}$ in the SM and physics beyond the SM (here we use the unparticle model as an example). The QPC model is employed to describe the creation of a pair of $q\bar q$ from vacuum. We find that the rate of $ψ(2S)\rightarrow Λ_c+\overline{Σ^+}$ is at order of $10^{-10}$ in the SM, whereas the contribution of the unparticle is too small to be substantial. Therefore if a large branching ratio is observed, it must be due to new physics beyond SM, but by no means the unparticle.

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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