2025/09/13 by Bibhabasu De, De, Bibhabasu
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2509.10939
openalex publication_date 2025/09/13 · openalex created_date 2025/10/12 · openalex updated_date 2026/07/28
The Direct Detection~(DD) experiments are vital for probing the particle nature of Dark Matter~(DM). However, in the absence of a scattering event, DD searches result in stringent bounds on the corresponding parameter space. The paper has considered a U(1)Lμ-Lτ-extension of the Standard Model~(SM) and augmented the particle spectrum with SU(2)L-singlet vector-like leptons and scalars. A discrete Z2 symmetry stabilizes the lightest SM-singlet vector-like lepton as the viable DM candidate. In the proposed model, amplitude-level cancellation can be achieved for both DM-electron and DM-quark scatterings, leading to a trivial explanation for the continuous null results in the DD experiments. The framework can also induce one-loop corrections to the lepton anomalous magnetic moments and Zℓ+ℓ- couplings. The experimental bounds on the Z→ℓ+ℓ- decays are instrumental in constraining the model parameters. Particularly, using the Z→τ+τ- decay, a stronger exclusion limit can be imposed on the U(1)Lμ-Lτ parameter space. Further, in the presence of three heavy right-handed neutrinos, transforming as Z2-even states, the model can explain all the neutrino mass and mixing constraints using the Type-I seesaw mechanism. Future experimental updates on the (g-2)_ℓ, Z→ℓ+ℓ- decays and improved bounds on the U(1)Lμ-Lτ theory can be crucial to test the proposed model. Moreover, future DD experiments searching for a DM-muon scattering might be significant to probe the considered DM-SM interaction.