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arXiv 1202.6288hep-ph
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轻子变味$Z'\toτμ$衰变的研究

Study of the lepton flavor-violating $Z'\toτμ$ decay

J. I. Aranda, J. Montano, F. Ramirez-Zavaleta, J. J. Toscano, E. S. Tututi

摘要:

在几种预测新规范玻色子$Z^\prime$存在的扩展模型中研究了轻子味破坏$Z^{\prime}\toτμ$衰变。利用最一般的包含轻子味破坏的可重正化拉格朗日量计算了轻子味破坏$Z^\primeμτ$耦合的强度。我们使用的μ子磁偶极矩的实验值绑定这种耦合,从$\mathrm{Re}(Ω_{Lμτ}Ω^\ast_{Rμτ})$参数的约束,它被发现,$\mathrm{Re}(Ω_{Lμτ}Ω^\ast_{Rμτ})\sim 10^{-2}$的$Z^\prime$玻色子质量为2 TeV。此外,我们采用的实验限制的$τ\toμγ$和$τ\toμμ^+μ^-$过程中的几个模型的背景下,预测存在的$Z^\prime$规范玻色子约束所提到的耦合。最严格的界限来自三体衰变的计算。对于这种情况,发现最具限制性的结果由矢量样耦合提供,表示为$|Ω_{μτ}|^2$,对于$Z_χ$情况,发现对于2 TeV的$Z^\prime$玻色子质量在$10^{-2}$周围。我们使用这些信息来估计$Z^\prime\toτμ$衰变的分支比。根据所分析的模型,最不乐观的结果是由序贯$Z$模型提供的,该模型对于约2 TeV的$Z^\prime$玻色子质量具有$10^{-2}$的量级。

英文摘要:

The lepton flavor violating $Z^{\prime}\toτμ$ decay is studied in the context of several extended models that predict the existence of the new gauge boson named $Z^\prime$. A calculation of the strength of the lepton flavor violating $Z^\primeμτ$ coupling is presented by using the most general renormalizable Lagrangian that includes lepton flavor violation. We used the experimental value of the muon magnetic dipole moment to bound this coupling, from which the $\mathrm{Re}(Ω_{Lμτ}Ω^\ast_{Rμτ})$ parameter is constrained and it is found that $\mathrm{Re}(Ω_{Lμτ}Ω^\ast_{Rμτ})\sim 10^{-2}$ for a $Z^\prime$ boson mass of 2 TeV. Alongside, we employed the experimental restrictions over the $τ\toμγ$ and $τ\toμμ^+μ^-$ processes in the context of several models that predict the existence of the $Z^\prime$ gauge boson to bound the mentioned coupling. The most restrictive bounds come from the calculation of the three-body decay. For this case, it was found that the most restrictive result is provided by a vector-like coupling, denoted as $|Ω_{μτ}|^2$, for the $Z_χ$ case, finding around $10^{-2}$ for a $Z^\prime$ boson mass of 2 TeV. We used this information to estimate the branching ratio for the $Z^\prime\toτμ$ decay. According to the analyzed models the least optimistic result is provided by the Sequential $Z$ model, which is of the order of $10^{-2}$ for a $Z^\prime$ boson mass around 2 TeV.

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