Probing maximal flavor changing Z′ in U ( 1 ) L μ − L τ at μTRISTAN
Year: 2025
Type: article
Abstract: We explore the potential to detect the U ( 1 ) L μ − L τ model featuring triplet scalars Δ at the μ TRISTAN collider. The new gauge boson Z ′, arising from the spontaneous breaking of U ( 1 ) L μ − L τ , can exhibit maximal flavor changing interactions under the exchange symmetry, while Δ mediates the flavor conserving interactions. The absence of muon ( g − 2 ) μ can be explained by interference effects arising from opposite contributions of Z ′ and Δ, with similar interference patterns also manifesting in the tau decay process τ → μ ν ν ¯ . These counteracting effects render the model phenomenologically interesting and warrant further investigation. For the mass m Z ′ in the range of hundreds of GeV, we find that μ + μ + and μ + e − collider at the μ TRISTAN can probe many regions inaccessible to current experiments and offer greater projected sensitivity than opposite-sign muon colliders. This suggests that μ TRISTAN can serve as complementary exploration to the U ( 1 ) L μ − L τ model, providing compelling motivation for the next generation of high-energy lepton colliders.
Source: Physics Letters B
Authors: Fei Huang, Jin Sun
Institutions: University of Jinan, Institute for Basic Science
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G1889065534, G8518482887
OpenAlex ID: W4416549104