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arXiv 2202.07248hep-phhep-ex
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核子引起的双粲$T_{cc}^+$的准fission现象

The quasi-fission phenomeonon of double charm $T_{cc}^+$ induced by nucleon

Jun He, Xiang Liu

备注：
5 pages, 3 figures
发表信息：
Eur. Phys. J. C 82, 387 (2022)
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摘要：

本文研究了核子与双粲态$T_{cc}$的反应。假设$T_{cc}$是$D^{*}D$的一种分子态，核子与$T_{cc}$的反应是通过$π$、$η$、$ρ$和$ω$介子的交换进行的，最终导致$T_{cc}$态分裂为两个$D$介子.利用有效拉格朗日量计算了$p+T^+_{cc}\to p+D^++D^0$过程的截面，发现在入射质子动量很小的情况下，可以得到很大的截面。当动量为GeV量级时，它随动量的增加而迅速减小到10 mb左右。如此大的截面表明，在质子诱导下，$T_{cc}^+$态很容易衰变并跃迁为两个$D$介子。在$T_{cc}^+$态的静止坐标系中，在Dalitz图上可以观察到末态$D$介子在小动量区的明显积累，这是由于对$T_{cc}$态的分子态解释.质子诱导双粲分子$T_{cc}^+$态的这种新的准裂变现象可以在即将进行的PANDA实验中实现。

英文摘要：

In this work, we study the reaction of a nucleon and a doubly charmed state $T_{cc}$. Under the assumption of the $T_{cc}$ as a molecular state of $D^{*}D$, the reaction of the nucleon and $T_{cc}$ is mediated by exchanges of $π$, $η$, $ρ$, and $ω$ meson, which results in split of $T_{cc}$ state with two $D$ mesons in final state. With the help of the effective Lagrangians, the cross section of $p+T^+_{cc}\to p+D^++D^0$ process is calculated, and a very large cross section can be obtained with very small incoming momentum of proton. It decrease rapidly with the increase of the momentum to about 10 mb at momenta of order of GeV. Such large cross section suggests that induced by a proton the $T_{cc}^+$ state is very easy to decay and transit to two $D$ mesons. In the rest frame of the $T_{cc}^+$ state, an obvious accumulation of final $D$ meson at small momentum region can be observed in predicted Dalitz plot, which is due to the molecular state interpretation of $T_{cc}$ state. This novel quasi-fission phenomenon of double charm molecular $T_{cc}^+$ state induced by a proton can be accessible at the forthcoming PANDA experiment.

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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