Abstract
We study a model with U(1)_{L_mu - L_tau } gauge symmetry and discuss collider searches for a scalar boson, which breaks U(1)_{L_mu - L_tau } symmetry spontaneously, decaying into light Z' gauge boson. In this model, the new gauge boson, Z', with a mass lighter than {mathcal {O}}(100) MeV, plays a role in explaining the anomalous magnetic moment of muon via one-loop contribution. For the gauge boson to have such a low mass, the scalar boson, phi with {mathcal {O}}(100) GeV mass appears associated with the symmetry breaking. We investigate experimental constraints on U(1)_{L_mu - L_tau } gauge coupling, kinetic mixing, and mixing between the SM Higgs and phi . Then collider search is discussed considering phi production followed by decay process phi rightarrow Z' Z' at the large hadron collider and the international linear collider. We also estimate discovery significance at the linear collider taking into account relevant kinematical cut effects.
Highlights
The standard model (SM) of particle physics has been describing phenomena over the wide range of energy scale from eV to TeV scale
We have studied a model with U (1)Lμ−Lτ gauge symmetry which is spontaneously broken by a VEV of SM singlet scalar field with non-zero Lμ − Lτ charge
In this model Z boson and new CP-even scalar boson φ are obtained after spontaneous symmetry breaking
Summary
The standard model (SM) of particle physics has been describing phenomena over the wide range of energy scale from eV to TeV scale. The Lμ − Lτ gauge symmetry is interesting in this regard because it is anomaly free extension and can explain the neutrino mass and mixings simultaneously [10,11,12]. In this model, it was shown in Refs. We begin our discussions with reviewing a model with gauged U (1)Lμ−Lτ symmetry under which muon (μ) and tau (τ ) flavor leptons are charged among the SM leptons. Inserting Eq (5) into Eq (4), the squared mass terms for CP-even scalar bosons are given by
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