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PreprintCC BY 4.0arXiv

Probing Lepton-Flavor-Violating Four-Lepton Operators at a Muon Collider

  • Sukanta Dutta
  • Purnath Unnikrishnan
  • Yashasvi
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Abstract

We investigate charged lepton-flavor violation (LFV) induced by dimension-six four-lepton operators within the Standard Model effective field theory(SMEFT) at a proposed high-energy muon collider. We study the processes μ+μ−→ e±τ∓, μ+μ−→ e±μ∓, and μ+μ−→ μ±τ∓ at √s=3, $10$, and $14$~TeV, incorporating beam polarization and hadronic τ reconstruction. Using an optimal-observable analysis of the angular distributions, we perform a global fit to the relevant set of four-lepton operators. Projected sensitivities reach C/Λ2∼(0.5−1.2) ×10−4 TeV−2, depending on the flavor and chiral structure of the operator, exceeding current limits by up to an order of magnitude. A combined analysis of multiple center-of-mass energies and beam polarizations significantly improves the resolution of correlations among the Wilson coefficients. These results highlight the strong sensitivity of a future multi-TeV muon collider to charged LFV four-lepton interactions, establishing it as a powerful probe of the SMEFT parameter space.

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Cite

BibTeXRIS
BibTeX
@misc{dutta2026probing,
  title = {{Probing Lepton-Flavor-Violating Four-Lepton Operators at a Muon Collider}},
  author = {Sukanta Dutta and Purnath Unnikrishnan and Yashasvi},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2607.26020},
  eprint = {2607.26020},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.26020},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Probing Lepton-Flavor-Violating Four-Lepton Operators at a Muon Collider
AU  - Sukanta Dutta
AU  - Purnath Unnikrishnan
AU  - Yashasvi
PY  - 2026
DA  - 2026/10/09
PB  - arXiv
DO  - 10.48550/arxiv.2607.26020
UR  - https://arxiv.org/abs/2607.26020
AB  - We investigate charged lepton-flavor violation (LFV) induced by dimension-six four-lepton operators within the Standard Model effective field theory(SMEFT) at a proposed high-energy muon collider. We study the processes μ^+μ^−→ e^±τ^∓, μ^+μ^−→ e^±μ^∓, and μ^+μ^−→ μ^±τ^∓ at √s=3, $10$, and $14$~TeV, incorporating beam polarization and hadronic τ reconstruction. Using an optimal-observable analysis of the angular distributions, we perform a global fit to the relevant set of four-lepton operators. Projected sensitivities reach C/Λ^2∼(0.5−1.2) ×10^−4 TeV^−2, depending on the flavor and chiral structure of the operator, exceeding current limits by up to an order of magnitude. A combined analysis of multiple center-of-mass energies and beam polarizations significantly improves the resolution of correlations among the Wilson coefficients. These results highlight the strong sensitivity of a future multi-TeV muon collider to charged LFV four-lepton interactions, establishing it as a powerful probe of the SMEFT parameter space.
ER  -