Probing maximal flavor changing Z' in U(1)_Lμ-Lτ at μTRISTAN

2025/07/07 by Huang, Fei, Sun, Jin
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2507.04614

Abstract

We explore the potential to detect the U(1)_Lμ-Lτ model featuring triplet scalars Δ at the μTRISTAN collider. The new gauge boson Z', arising from the spontaneous breaking of U(1)_Lμ-Lτ, 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→ μνν. 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 μTRISTAN can probe many regions inaccessible to current experiments and offer greater projected sensitivity than opposite-sign muon colliders. This suggests that μTRISTAN can serve as complementary exploration to the U(1)_Lμ-Lτ model, providing compelling motivation for the next generation of high-energy lepton colliders.

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