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arXiv 2111.09481hep-phhep-exhep-lat
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$D_{s0}^{*}(2317)$与$D_{s1}(2460)$及其底夸克对应粒子的强衰变和辐射衰变研究进展

Update on strong and radiative decays of the $D_{s0}^{*}(2317)$ and $D_{s1}(2460)$ and their bottom cousins

Hai-Long Fu, Harald W. Grießhammer, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meißner

AI总结:

针对此前底奇异介子质量违背重夸克味对称性、同位旋破缺贡献不全的问题,研究者修正相关粒子质量并纳入完整次领头阶同位旋破缺贡献,更新了粲奇异与底奇异强子分子态的强衰变和辐射衰变宽度,给出了寻找底奇异对应粒子的优选衰变道。

摘要:

本文重新研究了作为强子分子的正宇称粲奇异介子$D^{*}_{s0}$、$D_{s1}$,以及理论预言的其底奇异对应粒子$B^{*}_{s0}$、$B_{s1}$的同位旋破缺宽度和辐射衰变宽度。开展这项研究是必要的,因为《欧洲物理杂志A辑》(Eur. Phys. J. A 50 (2014) 149)中使用的$B^{*}_{s0}$和$B_{s1}$质量过小,与重夸克味对称性相矛盾,且当时未纳入所有同位旋破缺贡献。本文提出了一种恢复重夸克味对称性的方法,修正了$B^{*}_{s0}$和$B_{s1}$的质量,并纳入了直至次领头阶的全部同位旋破缺贡献。基于此,我们给出了$D^{*}_{s0}$、$D_{s1}$、$B^{*}_{s0}$和$B_{s1}$所有粒子的更新强子衰变宽度。同时,鉴于$D^{*+}$的衰变宽度测量精度已大幅提升,我们也更新了$D_{s0}^*(2317)$和$D_{s1}(2460)$辐射衰变的分宽度结果。研究发现,$B_sπ^0$和$B_sγ$分别是寻找$B_{s0}^*$和$B_{s1}$的优选衰变道。

英文摘要:

The isospin breaking and radiative decay widths of the positive-parity charm-strange mesons, $D^{*}_{s0}$ and $D_{s1}$, and their predicted bottom-strange counterparts, $B^{*}_{s0}$ and $B_{s1}$, as hadronic molecules are revisited. This is necessary, since the $B^{*}_{s0}$ and $B_{s1}$ masses used in Eur. Phys. J. A 50 (2014) 149 were too small, in conflict with the heavy quark flavour symmetry. Furthermore, not all isospin breaking contributions were considered. We here present a method to restore heavy quark flavour symmetry, correcting the masses of $B^{*}_{s0}$ and $B_{s1}$, and include the complete isospin breaking contributions up to next-to-leading order. With this we provide updated hadronic decay widths for all of $D^{*}_{s0}$, $D_{s1}$, $B^{*}_{s0}$ and $B_{s1}$. Results for the partial widths of the radiative deays of $D_{s0}^*(2317)$ and $D_{s1}(2460)$ are also renewed in light of the much more precisely measured $D^{*+}$ width. We find that $B_sπ^0$ and $B_sγ$ are the preferred channels for searching for $B_{s0}^*$ and $B_{s1}$, respectively.

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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