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arXiv 1905.08652hep-phhep-ex
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相对论夸克模型中半轻子$Ξ_c$重子衰变

Semileptonic $Ξ_c$ baryon decays in the relativistic quark model

R. N. Faustov, V. O. Galkin

摘要:

在基于准势方法的相对论夸克模型框架下计算了弱$Ξ_c\to Ξ(Λ)$跃迁的形状因子。所有的相对论效应,包括重子波函数从静止到运动参考系的变换以及中间负能态的贡献都被系统地考虑。给出了在整个可达运动学范围内形状因子对动量传递$q^2$依赖性的精确解析表达式。计算的形状因子的半轻子$Ξ_c\to Ξ\ellν_\ell$和$Ξ_c\to Λ\ellν_\ell$($\ell=e,μ$)的衰减率,不同的不对称性和螺旋度形式主义内的偏振参数的评估。所得结果与现有的实验数据和以前的计算进行了比较。

英文摘要:

The form factors of the weak $Ξ_c\to Ξ(Λ)$ transitions are calculated in the framework of the relativistic quark model based on the quasipotential approach. All relativistic effects including transformations of the baryon wave functions from the rest to moving reference frame and contributions of the intermediate negative energy states are systematically taken into account. The explicit analytic expressions which reliably approximate the momentum transfer $q^2$ dependence of the form factors in the whole accessible kinematical range are given. The calculated form factors are applied for the evaluation of the semileptonic $Ξ_c\to Ξ\ellν_\ell$ and $Ξ_c\to Λ\ellν_\ell$ ($\ell=e,μ$) decay rates, different asymmetry and polarization parameters within helicity formalism. The obtained results are compared with available experimental data and previous calculations.

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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