论文标题
$ b \ rightarrow c \，τ\，\barν$异常的新物理解决方案
New Physics solutions for $b\rightarrow c\,τ\,\barν$ anomalies after Moriond 2019
论文作者
论文摘要
在Moriond 2019上，Belle合作宣布了有关风味比$ r_d -r_d -r_ {d^*} $的新测量结果，这些测量符合其标准模型预测在$1.2σ$之内。包含这些测量值后，$ r_d -r_ {d^*} $中的全局张力已从$4.1σ$减少到$3.1σ$，这仍然很重要。这些比率的测量表明，违反了$ b \ rightarrow c \，l \，\barν$衰变的违反Lepton风味普遍性。假设$ b \ rightarrow c \，τ\，\barν$过渡中的新物理学，我们对该领域中的所有可用数据进行了全局拟合，以识别允许的新物理解决方案。我们发现有七个允许的新物理解决方案可以说明$ b \ rightarrow c \，τ\，\barν$ transition中的所有测量。我们表明，在$ b \ rightarrow d \中同时测量$τ$极化分数和向前的不对称性，τ\，τ\，\barν$，$ b \ rightarrow d^*f \ rightarrow d^*τ\barν$的零向后不对称的零交叉点，$ bar的分支$ bar the $ bar the the $ bar the the $ bbat \ the the the $ bbat \ the the the the $ bbat \ the the the the $ bbatish新的物理解决方案如果可以用所需的精度测量它们。
At Moriond 2019, Belle collaboration has announced new measurements on the flavour ratios $R_D - R_{D^*}$ which are consistent with their Standard Model predictions within $1.2σ$. After inclusion of these measurements, the global tension in $R_D - R_{D^*}$ has reduced from $4.1σ$ to $3.1σ$ which is still significant. The measurements of these ratios indicate towards the violation of lepton flavor universality in $b\rightarrow c\,l\,\barν$ decay. Assuming new physics in $b\rightarrow c\,τ\,\barν$ transition, we have done a global fit to all available data in this sector to identify the allowed new physics solutions. We find that there are seven allowed new physics solutions which can account for all measurements in $b\rightarrow c\,τ\,\barν$ transition. We show that a simultaneous measurement of the $τ$ polarization fraction and forward-backward asymmetry in $B\rightarrow D\,τ\,\barν$, the zero crossing point of forward backward asymmetry in $B\rightarrow D^*τ\barν$ and the branching ratio of $B_c\rightarrow τ\,\barν$ decay can distinguish these seven new physics solutions if they can be measured with a required precision.
