arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1702.01089hep-ph
收藏

包含半声子$B$衰变到${\cal O} (Λ_{QCD}^3/m_b^3)$阶

Inclusive Semitauonic $B$ Decays to Order ${\cal O} (Λ_{QCD}^3/m_b^3)$

Thomas Mannel, Aleksey V. Rusov, Farnoush Shahriaran

摘要:

我们计算了包含$\bar B \to X_c τ\bar ν_τ$过程的衰变宽度、$τ$轻子能量分布以及相应的矩,包括$Λ_{QCD}^3/m_b^3$级的功率修正和部分子级的QCD修正.我们比较的结果与标准模型的预测的总和的专用半轻子$\bar B \to (D, D^*, D^{**}) τ\bar ν_τ$衰变的分支分数,以及与相关的实验数据。我们的预测是一致的LEP测量和标准模型计算的排他性模式是一致的。我们讨论了标准模型之外的物理学的影响。

英文摘要:

We calculate the decay width and the $τ$-lepton energy distribution as well as relevant moments for inclusive $\bar B \to X_c τ\bar ν_τ$ process including power corrections up to order $Λ_{QCD}^3/m_b^3$ and QCD corrections to the partonic level. We compare the result with the sum of the standard-model predictions of the branching fractions of the exclusive semileptonic $\bar B \to (D, D^*, D^{**}) τ\bar ν_τ$ decays as well as with the relevant experimental data. Our prediction is in agreement with the LEP measurement and is consistent with the standard-model calculation of the exclusive modes. We discuss the impact from physics beyond the Standard Model.

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。

↑