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arXiv 2007.04010hep-ph
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双重重子$Ξ_{bc}$的唯一衰变

Exclusive Decays of the Doubly Heavy Baryon $Ξ_{bc}$

A. V. Luchinsky, A. K. Likhoded

摘要:

分析了具有轻介子产生的$Ξ_{bc}^+$的排他性衰变$Ξ_{bc}^+\toΞ_{cc}^{++}\mathcal{R}$。在因子分解模型的框架中,所考虑的反应的矩阵元素被写成$Ξ_{bc}\toΞ_{cc}W$和$W\to\mathcal{R}$跃迁振幅的乘积。因此,对这些衰变的理论和实验研究使我们能够测试重夸克和轻夸克扇区的物理学。给出了这些反应的分支分数,以及在光系统不变质量和其他一些运动学变量上的分布。我们的计算表明,所考虑的反应的概率是足够高的,所以所提出的结果可能有助于尚未见过的$Ξ_{bc}$重子的观察。

英文摘要:

Exclusive decays of the $Ξ_{bc}^+$ with light mesons production, $Ξ_{bc}^+\toΞ_{cc}^{++}\mathcal{R}$ are analyzed. In the framework of the factorization model the matrix elements of the considered reactions are written as a product of $Ξ_{bc}\toΞ_{cc}W$ and $W\to\mathcal{R}$ transition amplitudes. As a result theoretical and experimental investigation of these decays allow us to test the physics of heavy and light quarks' sectors. Presented are the branching fractions of these reactions, as well as the distributions over the invariant mass of the light system and some other kinematical variables. Our calculations show that the probabilities of the considered reactions are high enough, so presented results could help with observation of yet unseen $Ξ_{bc}$ baryon.

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