arXiv 2307.005312023-07-02hep-ph

$U(1)_{L_μ-L_τ}$中具有最大PDMATHAAB耦合的$Z'$的μ子对撞机特征

Muon collider signatures for a $Z'$ with a maximal $μ-τ$ coupling in $U(1)_{L_μ-L_τ}$

Jin Sun, Fei Huang, Xiao-Gang He

备注：: 10 pages, 7 figures

摘要：

规范$U(1)_{L_μ- L_τ}$模型是解释μ子g-2异常的候选模型，因为模型中的$Z'$与μ子具有自然的正态耦合。由于其他实验数据的限制，通常的$Z'$的可行质量范围被限制为低于几百MeV。已经表明，如果$Z'$具有最大非对角混合$(\bar μγ^μτ+ \bar τγ^μμ) Z'_μ$，则$Z'$的大质量是可能的。这类模型有一个非常有趣的检测签名，如$μ^-μ^+ \to τ^- τ^+$对，$μ^- μ^+ \to μ^\pmμ^\pm τ^\mp τ^\mp$在μ子对撞机。在这项工作中，我们详细研究这些过程。我们发现，在参数空间中求解μ介子g-2反常，t通道$τ^- τ^+$对产生可以很容易地在5个以上的$σ$水平上与标准模型中预测的s通道产生区分开来.双同号$μ^\pm μ^\pm + τ^\mpτ^\mp$对产生的吸烟枪签名可以具有5 $σ$灵敏度，在3 TeV的μ子对撞机上具有$\mathcal{O}$（$fb^{-1}$）亮度。

英文摘要：

The gauged $U(1)_{L_μ- L_τ}$ model is a candidate model for explaining the muon g-2 anomaly because the $Z'$ in the model has a natural normal coupling to muon. Due to other experimental data constraints the viable mass range for the usual $Z'$ is constrained to be lower than a few hundred MeV. It has been shown that if the $Z'$ has a maximal off-diagonal mixing, $(\bar μγ^μτ+ \bar τγ^μμ) Z'_μ$, a large mass for $Z'$ is possible. This class of models has a very interesting signature for detection, such as $μ^-μ^+ \to τ^- τ^+$ pair, $μ^- μ^+ \to μ^\pmμ^\pm τ^\mp τ^\mp$ at a muon collider. In this work we study in detail these processes. We find that the in the parameter space solving the muon g-2 anomaly, t-channel $τ^- τ^+$ pair production can easily be distinguished at more than 5$σ$ level from the s-channel production as that predicted in the standard model. The smoking gun signature of doubly same sign $μ^\pm μ^\pm + τ^\mpτ^\mp$ pairs production can have a 5$σ$ sensitivity, at a muon collider of 3 TeV with $\mathcal{O}$($fb^{-1}$) luminosity.

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