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arXiv 2004.12444hep-ph
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Bethe-Salpeter方程框架下重轻夸克偶素通过$M1$和$E1$跃迁的辐射衰变

Radiative decays of heavy-light quarkonia through $M1$, and $E1$ transitions in the framework of Bethe-Salpeter equation

Shashank Bhatnagar, Eshete Gebrehana

摘要:

在这项工作中,我们研究了通过M1和E1跃迁的重轻夸克偶素的辐射衰变,这涉及到两个强子顶点的夸克三角图,并且在BSE-CIA中难以评估。我们已经表示的过渡振幅,$M_{fi}$作为一个线性叠加的条款,涉及所有可能的组合的$++$,和$--$组件的Salpeter波函数的最终和初始强子,与系数有关的结果在复杂的$σ$平面上的极点积分。我们评估了$M1$跃迁($^3S_1 \rightarrow ^1S_0 +γ$)和$E1$跃迁($^3S_1 \rightarrow ^1P_0 +γ$和$^1P_0 \rightarrow ^3S_1 +γ$)的衰减宽度。本文利用在近似谐振子基下解析$0^{++},1^{--}$和$0^{-+}$重轻夸克偶素基态和激发态质量谱方程得到的Salpeter波函数的代数形式,计算了它们的衰变宽度。我们使用的输入参数是通过拟合它们的质谱得到的。我们比较了我们的结果与实验数据和其他模型,并发现合理的协议。

英文摘要:

In this work we study the radiative decays of heavy-light quarkonia through M1 and E1 transitions, that involve quark-triangle diagrams with two hadron vertices, and are difficult to evaluate in BSE-CIA. We have expressed the transition amplitude, $M_{fi}$ as a linear superposition of terms involving all possible combinations of $++$, and $--$ components of Salpeter wave functions of final and initial hadron, with coefficients being related to results of pole integrals over complex $σ$- plane. We evaluate the decay widths for $M1$ transitions ($^3S_1 \rightarrow ^1S_0 +γ$), and $E1$ transitions ($^3S_1 \rightarrow ^1P_0 +γ$ and $^1P_0 \rightarrow ^3S_1 +γ$). We have used algebraic forms of Salpeter wave functions obtained through analytic solutions of mass spectral equations for ground and excited states of $0^{++},1^{--}$, and $0^{-+}$ heavy-light quarkonia in approximate harmonic oscillator basis, to calculate their decay widths. The input parameters used by us were obtained by fitting to their mass spectra. We have compared our results with experimental data and other models, and found reasonable agreements.

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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