Heavy neutral leptons in gauged U(1)Lμ-Lτ at muon collider  

作　　者：Ru-Yi He Jia-Qi Huang Jin-Yuan Xu Fa-Xin Yang Zhi-Long Han Feng-Lan Shao 何如意;黄佳琪;许金源;杨法新;韩志龙;邵凤兰(School of Physics and Technology,University of Jinan,Jinan 250022,China;School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China)

机构地区：[1]School of Physics and Technology,University of Jinan,Jinan 250022,China [2]School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China

出　　处：《Chinese Physics C》2024年第9期36-49,共14页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China (12375074, 11805081);the Natural Science Foundation of Shandong Province,China(ZR2019QA021)。

摘　　要：Heavy neutral leptons N are the most appealing candidates to generate tiny neutrino masses.We studied the signature of heavy neutral leptons in gauged U(1)Lμ-Lτ at a muon collider.Charged under the U(1)Lμ-Lτ symmetry,the heavy neutral leptons can be pair produced via the new gauge boson Z' at the muon collider as μ^(+)μ^(-)→Z′*→NN AND μ^(+)μ^(-)→Z′(*)γ→NNγ.We then performed a detailed analysis on the lepton number violation signature μ^(+)μ^(-)→NN→μ^(±)μ^(±)W■W■ and μ^(+)μ^(-)→NN→μ^(±)μ^(±)W■W■γ at the 3 TeV muon collider,where the hadronic decays of W boson are treated as fat-jets J.These lepton number violation signatures have quite clean backgrounds at the muon collider.Our simulation shows that a wide range of viable parameter space is within the reach of the 3 TeV muon collider.For instance,with new gauge coupling g'=0.6 and an integrated luminosity of 1000 fb^(-1),the μ^(±)μ^(±)JJ signal could probe m_(Z′)■13 TeV.Meanwhile,if the gauge boson mass satisfies 2m_(N)<√s,the μ^(±)μ^(±)JJγ signature would be more promising than the μ^(±)μ^(±)JJ signature.

关 键 词：heavy neutral leptons gauged U(1)_(Lμ-Lτ) muon collider lepton number violation 

分 类 号：O572.214[理学—粒子物理与原子核物理]