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arXiv 1406.7018hep-phhep-ex
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类矢量轻子对$h\to 4\ell$的影响及其与μ子g-2异常的联系

Effects of vectorlike leptons on $h\to 4\ell$ and the connection to the muon g-2 anomaly

Radovan Dermisek, Aditi Raval, Seodong Shin

摘要:

在标准模型中,新的类矢量轻子与轻子的混合可以在重轻子和轻轻子之间产生$h$、$W$和$Z$的味违反耦合。聚焦于μ子的耦合,当运动学允许这个过程时,$h\to e_4^\pm μ^\mp$的部分衰变宽度(其中$e_4$是新的轻子)可能是显著的。随后的衰变$e_4^\pm \to Zμ^\pm$和$e_4^\pm \to W^\pm ν$导致与$h \to ZZ^* \to Z μ^+μ^-$和$h \to WW^* \to W μν$相同的最终状态,因此可能影响这些过程的测量。我们计算了$h\to e_4 \ell_i \to Z\ell_i\ell_j$,其中$\ell_{i,j}$是标准模型轻子,包括离壳衰变的可能性,对$h\to ZZ^* \to Z \ell_i \ell_i$的干扰,以及$\ell_{i,j}$的质量效应,当$e_4$的质量接近Higgs玻色子的质量时,这些都是重要的。我们从$h\to 4\ell$的测量中导出了重轻子的质量和耦合的约束。我们专注于μ介子的耦合,并讨论可能的影响$h\to ZZ^*$从区域的参数,可以解释测量μ介子g-2的异常。

英文摘要:

The mixing of new vectorlike leptons with leptons in the standard model can generate flavor violating couplings of $h$, $W$ and $Z$ between heavy and light leptons. Focusing on the couplings of the muon, the partial decay width of $h\to e_4^\pm μ^\mp$, where $e_4$ is the new lepton, can be significant when this process is kinematically allowed. Subsequent decays $e_4^\pm \to Zμ^\pm$ and $e_4^\pm \to W^\pm ν$ lead to the same final states as $h \to ZZ^* \to Z μ^+μ^-$ and $h \to WW^* \to W μν$, thus possibly affecting measurements of these processes. We calculate $h\to e_4 \ell_i \to Z\ell_i\ell_j$, where $\ell_{i,j}$ are standard model leptons, including the possibility of off-shell decays, interference with $h\to ZZ^* \to Z \ell_i \ell_i$, and the mass effect of $\ell_{i,j}$ which are important when the mass of $e_4$ is close to the mass of the Higgs boson. We derive constraints on masses and couplings of the heavy lepton from the measurement of $h\to 4\ell$. We focus on the couplings of the muon and discuss possible effects on $h\to ZZ^*$ from the region of parameters that can explain the anomaly in the measurement of the muon g-2.

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。

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