Heavy Neutral Leptons in Gauged U(1)_L_μ-L_τ at Muon Collider
arxiv(2024)
摘要
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)_L_μ-L_τ at a muon collider. Charged under the
U(1)_L_μ-L_τ 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
m_Z'≲ 12.5 TeV. Meanwhile, if the gauge boson mass satisfies 2
m_N更多
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