论文标题
$ b \ tocτ\barν$过渡的复杂新物理学的签名
Signatures of complex new physics in $b\to cτ\barν$ transitions
论文作者
论文摘要
$ r_d $和$ r_ {d^*} $的测量中的异常继续为超出标准模型以外的物理提供动力。在这项工作中，我们假设新的物理威尔逊系数是复杂的，并通过对当前的$ b \ rightarrowcτ\barν$数据进行全球拟合来找到其值。我们发现，允许的解决方案的数量取决于$ br（b_c \rightarrowτ\barν）$的上限的选择。我们发现，$ b \ rightarrow（d，d^*）τ\barν$衰减中的前向后不对称具有区分不同解决方案的能力。此外，我们计算了$ b \ to d^*τ\barν$衰减中违反三级产品不对称的CP的最大值，允许当前数据。我们观察到，只有三个CP不对称中的一个可以增强到$ \ sim 2-3 \％$的最大值，而另一个不对称的值仍然较小。
The anomalies in the measurements of $R_D$ and $R_{D^*}$ continue to provide motivation for physics beyond the Standard Model. In this work, we assume the new physics Wilson coefficients to be complex and find their values by doing a global fit to the present $b\rightarrow cτ\barν$ data. We find that the number of allowed solutions depend on the choice of the upper limit on $Br(B_c\rightarrow τ\barν)$. We find that the forward-backward asymmetries in $B\rightarrow (D, D^*)τ\barν$ decays have the capability to distinguish between different solutions. Further we calculate the maximum values of CP violating triple product asymmetries in $B\to D^*τ\barν$ decay allowed the current data. We observe that only one of the three CP asymmetries can be enhanced up to a maximum value of $\sim 2-3\%$ whereas the other asymmetries remain smaller.
