Probing maximal flavor changing $Z'$ in $U(1)_{L_μ-L_τ}$ at $μ$TRISTAN
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| Format: | Preprint |
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2025
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| _version_ | 1866909677257752576 |
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| author | Huang, Fei Sun, Jin |
| author_facet | Huang, Fei Sun, Jin |
| contents | 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 $τ\to μν\barν$. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_04614 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing maximal flavor changing $Z'$ in $U(1)_{L_μ-L_τ}$ at $μ$TRISTAN Huang, Fei Sun, Jin High Energy Physics - Phenomenology 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 $τ\to μν\barν$. 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. |
| title | Probing maximal flavor changing $Z'$ in $U(1)_{L_μ-L_τ}$ at $μ$TRISTAN |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.04614 |