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arXiv 2502.09883hep-phhep-ex
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$\u00afB_s$→$D_s^{(*)}\ell\bar\nu_\ell$衰变中的不可因子化QED修正

The nonfactorizable QED correction to the $\overline{B}_{s}$ ${\to}$ $D_{s}^{(\ast)} {\ell} \barν_{\ell}$ decays

Yueling Yang, Jiazhi Li, Liting Wang, Junfeng Sun

AI总结:

本文在考虑不可因子化QED修正后重新计算了$\overline{B}_s$→$D_s^{(*)}\ell\bar\nu_\ell$衰变的分支比,发现QED贡献提高分支比并降低$R(D_s^{(*)})$,同时验证了$SU(3)$味对称性在$R(D)$-$R(D^*)$中基本成立。

摘要:

考虑不可因子化QED修正后,重新计算了半轻子衰变$\overline{B}_{s} {\to} D_{s}^{(\ast)} {\ell} \bar\nu_{\ell}$的分支比及分支比比值$R(D_{s}^{({\ast})})$。研究发现:(a) QED贡献可以提高分支比,并降低比值$R(D_{s}^{({\ast})})$。(b) 在半轻子粲介子$\overline{B}_{u,d,s}$衰变的比值$R(D)$-$R(D^{\ast})$中,$SU(3)$味对称性基本保持良好。(c) 目前由形状因子带来的分支比${\cal B}(\overline{B}_{s} {\to} D_{s}^{\ast} {\ell} \bar\nu_{\ell})$的理论不确定性非常大。

英文摘要:

Considering the nonfactorizable QED corrections, the branching ratios and ratios of branching ratios $R(D_{s}^{({\ast})})$ for the semileptonic $\overline{B}_{s}$ ${\to}$ $D_{s}^{(\ast)} {\ell} \barν_{\ell}$ decays are reevaluated. It is found that (a) the QED contributions can enhance the branching ratios and reduce the ratios $R(D_{s}^{({\ast})})$. (b) The $SU(3)$ flavor symmetry holds basically well in the ratios $R(D)$-$R(D^{\ast})$ for the semileptonic charmed $\overline{B}_{u,d,s}$ decays. (c) The current theoretical uncertainties of branching ratios ${\cal B}(\overline{B}_{s} {\to} D_{s}^{\ast} {\ell} \barν_{\ell})$ from the form factors are very large.

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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