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arXiv 1804.04844hep-ph
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半轻子$B_{(s)}\to a_1(K_1)\ell^+ \ell^-$衰变的光锥求和规则和$B$ -介子分布振幅

Semileptonic $B_{(s)}\to a_1(K_1)\ell^+ \ell^-$ decays via the light-cone sum rules with $B$-meson distribution amplitudes

S. Momeni, R. Khosravi

摘要:

在光锥求和规则的框架下研究了半轻子$B_{(s)}\to a_{1}(K_1)\, \ell^{+}\ell^{-}$,$ \ell=τ,μ,e$跃迁的形状因子,其中$B$ -介子分布振幅在$B$排斥衰变中起重要作用.由于$B$介子分布振幅$φ_{\pm}(ω)$是一种依赖于模型的形式,因此我们考虑了四种不同的参数化方法,它们可以从QCD修正中对$φ_{\pm}(ω)$进行合理的描述。计算了这些跃迁的分支分数。为了更好地分析,我们的结果与其他模型的预测进行了比较。

英文摘要:

The form factors of semileptonic $B_{(s)}\to a_{1}(K_1)\, \ell^{+}\ell^{-}$, $ \ell=τ,μ,e$ transitions are investigated in the framework of the light-cone sum rules with $B$-meson distribution amplitudes, which play an important role in exclusive $B$ decays. The $B$-meson distribution amplitudes, $φ_{\pm}(ω)$ are a model-dependent form, so we consider four different parameterizations which can provide a reasonable description of $φ_{\pm}(ω)$ from QCD corrections. The branching fractions of these transitions are calculated. For a better analysis, a comparison of our results with the prediction of other models is provided.

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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