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arXiv 1607.04696hep-phhep-exnucl-th
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Bottomonium的光谱和电磁跃迁

Spectrum and electromagnetic transitions of bottomonium

Wei-Jun Deng, Hui Liu, Long-Cheng Gui, Xian-Hui Zhong

摘要:

在新的bottomonium态的观测进展的鼓舞下,我们研究了bottomonium谱。为了计算质谱,我们采用非相对论屏蔽势模型。采用三点差分中心法求解径向薛定谔方程,其中自旋相关势采用非微扰处理。用这种处理方法,可以成功地包含自旋相关势对波函数的修正。此外,我们还计算了$nS$($n\leq 4$),$nP$($n\leq 3$)和$nD$($n\leq 2$)底鎓态的电磁跃迁,并采用了一个广泛应用于光生介子反应的非相对论电磁跃迁算符。我们预测的bottomonium态的质量、超精细和精细分裂、电磁跃迁宽度和分支比与实验数据符合得很好。特别地,考虑到自旋相关相互作用对波函数的修正,可以合理地解释$Υ(3S)\to χ_{b1,2}(1P)γ$的电磁跃迁,这在以前的研究中并没有得到很好的解释.我们还讨论了利用辐射跃迁观测到的缺失的bottomonium态。一些重要的辐射衰变链涉及失踪的bottomonium状态建议被观察到。我们希望我们的研究能为以后的实验提供一些有用的参考。

英文摘要:

Stimulated by the exciting progress in the observation of new bottomonium states, we study the bottomonium spectrum. To calculate the mass spectrum, we adopt a nonrelativistic screened potential model. The radial Schrödinger equation is solved with the three-point difference central method, where the spin-dependent potentials are dealt with non-perturbatively. With this treatment, the corrections of the spin-dependent potentials to the wave functions can be included successfully. Furthermore, we calculate the electromagnetic transitions of the $nS$ ($n\leq 4$), $nP$ ($n\leq 3$), and $nD$ ($n\leq 2$) bottomonium states with a nonrelativistic electromagnetic transition operator widely applied to meson photoproduction reactions. Our predicted masses, hyperfine and fine splittings, electromagnetic transition widths and branching ratios of the bottomonium states are in good agreement with the available experimental data. Especially, the EM transitions of $Υ(3S)\to χ_{b1,2}(1P)γ$, which were not well understood in previous studies, can be reasonably explained by considering the corrections of the spin-dependent interactions to the wave functions. We also discuss the observations of the missing bottomonium states by using radiative transitions. Some important radiative decay chains involving the missing bottomonium states are suggested to be observed. We hope our study can provide some useful references to observe and measure the properties of bottomonium mesons in forthcoming experiments.

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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