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arXiv 1709.08644hep-ph
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与$R_{D^{(*)}}$异常有关的对$B_c \to J/ψτ\barν$的新物理效应

New Physics effect on $B_c \to J/ψτ\barν$ in relation to the $R_{D^{(*)}}$ anomaly

Ryoutaro Watanabe

摘要:

我们研究了可能的新物理(NP)对$B_c \to J/ψτ\barν$的影响,这是最近在LHCb测量的$R_{J/ψ} = \mathcal B(B_c \to J/ψτ\barν)/\mathcal B(B_c \to J/ψμ\barν)$的比例。结合它与长期的$R_{D^{(*)}}$测量,其中与标准模型的预测存在差异,我们找到了几个NP类型的异常可能的解决方案。然后,我们看到添加$R_{J/ψ}$测量并没有改善NP对数据的拟合,但是NP场景仍然给出比SM更好的$χ^2$。我们还调查了间接NP约束的$B_c$和NP预测的$τ$纵向极化$\bar B \to D^* τ\barν$的寿命。

英文摘要:

We study possible new physics (NP) effects on $B_c \to J/ψτ\barν$, which has been recently measured at LHCb as the ratio of $R_{J/ψ} = \mathcal B(B_c \to J/ψτ\barν)/\mathcal B(B_c \to J/ψμ\barν)$. Combining it with the long-standing $R_{D^{(*)}}$ measurements, in which the discrepancy with the prediction of the standard model is present, we find possible solutions to the anomaly by several NP types. Then, we see that adding the $R_{J/ψ}$ measurement does not improve NP fit to data, but the NP scenarios still give better $χ^2$ than the SM. We also investigate indirect NP constraints from the lifetime of $B_c$ and NP predictions on the $τ$ longitudinal polarization in $\bar B \to D^* τ\barν$.

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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