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arXiv 1806.02076hep-phhep-ex
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$B_{c}$ $\to$ $ J/ψV $和$B_{c}^{*}$ $\to$ $η_{c}V$在QCD因子分解中衰变的研究

Study of $B_{c}$$\to$$ J/ψV $ and $B_{c}^{*}$$\to$$η_{c}V$ decays within the QCD factorization

Qin Chang, Li-Li Chen, Shuai Xu

摘要:

本文在QCD因子分解框架下研究了非轻子$B_{c}\to J/ψV$和$B_{c}^{*}\toη_{c}V$ ~ $(V=ρ\,,K^{*})$弱衰变。在评估中,形状因子分别使用Bauer-Stech-Wirbel模型和光阵面夸克模型计算。除了纵向振幅,功率抑制的横向贡献也在次领先的顺序进行评估。给出了$B_{c}\to J/ψV$和$B_{c}^{*}\toη_{c}V$衰变的观测值的预言。我们发现,非线性光学QCD贡献对分支比的修正近似为$ 8\%$修正,并且这些衰变的纵极化率都在$(80\sim90)\%$水平。此外,我们还提出了一些有用的比值$R_{K^{*}/ρ}^{(λ=0)}$和$\widetilde{R}^{(λ=0)}_{K^{*}/ρ}$的直接测量方法,它们的理论不确定度可以得到很好的控制,非常适合于检验理论预测与数据的一致性。

英文摘要:

In this paper, we study the non-leptonic $B_{c}\to J/ψV$ and $B_{c}^{*}\toη_{c}V$~$(V=ρ\,,K^{*})$ weak decays in the framework of QCD factorization. In the evaluation, the form factors are calculated by using the Bauer-Stech-Wirbel model and the light-front quark model, respectively. Besides the longitudinal amplitude, the power-suppressed transverse contributions are also evaluated at next-to-leading order. The predictions for the observables of $B_{c}\to J/ψV$ and $B_{c}^{*}\toη_{c}V$ decays are presented. We find that the NLO QCD contribution presents about $ 8\%$ correction to the branching ratios, and the longitudinal polarization fractions of these decays are at the level of $(80\sim90)\%$. In addition, we suggest direct measurements on some useful ratios, $R_{K^{*}/ρ}^{(λ=0)}$ and $\widetilde{R}^{(λ=0)}_{K^{*}/ρ}$, which are very suitable for test the consistence between theoretical prediction and data because their theoretical uncertainties can be well-controlled.

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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