缓解MSSM中的$\bar B \to D τν$和$\bar B \to D^* τν_τ$难题
Alleviating the $\bar B \to D τν$ and $\bar B \to D^* τν_τ$ puzzle in the MSSM
摘要：
我们表明，企鹅的贡献$b \to c τν_τ$过渡驱动的超对称效应能够同时占一个相当大的增加的两个分支比的$\bar{B}\to D τ\barν_τ$和$\bar{B} \to D^{*} τ\barν_τ$相对于标准模型的预测，从而接近他们的实验测量值。我们强调，轻电荷伴子和中性伴子，质量小于300 GeV，除了一个大的Stau/snueutrino质量和一个大的$\tanβ$，是必不可少的增强效应的轻子企鹅$τν_τW^{\pm}$，这是负责改进的理论预测与目前的数据。
英文摘要：
We show that Supersymmetric effects driven by penguin contributions to the $b \to c τν_τ$ transition are able to account simultaneously for a sizeable increase of both branching ratios of $\bar{B}\to D τ\barν_τ$ and $\bar{B} \to D^{*} τ\barν_τ$ with respect to the Standard Model predictions, thereby approaching their experimentally measured values. We emphasise that a light chargino and neutralino, with masses less than 300 GeV, in addition to a large stau/snueutrino mass and a large $\tanβ$, are essential for enhancing the effect of the lepton penguin $τν_τW^{\pm}$, which is responsible for the improved theoretical predictions with respect to current data.
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