论文标题
探测Electron Collider的$L_μ-L_τ$量规
Probing the $L_μ-L_τ$ gauge boson at electron colliders
论文作者
论文摘要
我们研究了最小$ u（1）_ {l_μ-l_τ} $型号，具有额外的重型向量液体或带电的标量。通过研究$ u（1）_ {l_μ-l_τ}之间的动力学混合，$ gauge boson $ z^\ prime $和标准模型光子，这是在树级上不存在的，并且由于$μ$，$τ$，$τ$和新的重电leptons或sculars而在一个环水平上出现。它可以为新的重颗粒的可见特征提供可能。我们建议在Electron Collider实验中搜索$ Z^\ Prime $，例如Belle II，Besiii和Future Super Tau Charm Factory（STCF），使用Monophoton最终状态。 $ z^\ prime $的参数空间是探测的，并通过其量规耦合常数$ g_ {z^\ prime} $和质量$ m_ {z^\ prime} $进行扫描。我们发现，电子乘客对$ z^\ prime $的先前未开发的参数空间具有敏感性。使用$ \ sqrt s = 2-7 $ GEV进行的未来STCF实验可以排除异常的磁矩偏爱区域时，当$ m_ {z^\ prime} <5 $ gev，亮度为30 ab $^{ - 1} $。对于$ m_ {z^\ prime} <2m_μ$，$ g_ {z^\ prime} $可以降低至2 gev stcf的$ 4.2 \ times 10^{ - 5} $。
We investigate the minimal $U(1)_{L_μ-L_τ}$ model with extra heavy vector-like leptons or charged scalars. By studying the kinetic mixing between $U(1)_{L_μ-L_τ}$ gauge boson $Z^\prime$ and standard model photon, which is absent at tree level and will arise at one loop level due to $μ$, $τ$ and new heavy charged leptons or scalars, the interesting behavior is shown. It can provide possibility for visible signatures of new heavy particles. We propose to search for $Z^\prime$ at electron collider experiments, such as Belle II, BESIII and future Super Tau Charm Factory (STCF), using the monophoton final state. The parameter space of $Z^\prime$ is probed, and scanned by its gauge coupling constant $g_{Z^\prime}$ and mass $m_{Z^\prime}$. We find that electron colliders have sensitivity to the previously unexplored parameter space for $Z^\prime$ with MeV-GeV mass. Future STCF experiments with $\sqrt s=2-7$ GeV can exclude the anomalous muon magnetic moment favored area when $m_{Z^\prime}<5$ GeV with the luminosity of 30 ab$^{-1}$. For $m_{Z^\prime} < 2m_μ$, $g_{Z^\prime}$ can be down to $4.2\times 10^{-5}$ at 2 GeV STCF.
