2024/01/26 by He, Ru-Yi, Huang, Jia-Qi, Xu, Jin-Yuan +3 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2401.14687
Heavy neutral leptons N are the most appealing candidates to generate the tiny neutrino masses. In this paper, we study 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 muon collider as μ+μ-→ Z′ *→ NN and μ+μ-→ Z′ (*) γ→ NNγ. We then perform a detailed analysis on the lepton number violation signature μ+μ-→ NN→ μ^±μ^± W^∓ W^∓ and μ+μ-→ NN γ→ 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 mZ'\lesssim 12.5 TeV. Meanwhile, if the gauge boson mass satisfies 2 mN