Open Access

Lepton flavor violating top quark FCNC processes at the $μ TRISTAN$

Department of Physics, Indian Institute of Technology Guwahati, North Guwahati 781039, India

^*Contact author: sarkar.abhik@iitg.ac.in

Phys. Rev. D 113, 095010 – Published 5 May, 2026

DOI: https://doi.org/10.1103/jnnt-6t8f

Abstract

We investigate charged lepton flavor violating top quark flavor-changing neutral current interactions at the proposed asymmetric muon-electron collision stage of the $μ TRISTAN$ collider, operating at a center-of-mass energy of 346 GeV. Specifically, we study the process $μ^{+} e^{-} \to t q$ ( $t \bar{q} + \bar{t} q$ ) with $q = u$ , $c$ , within the framework of three classes of four-fermion contact interactions: scalar, vector, and tensor operators. A cut-based analysis is performed using boost-invariant kinematic observables, followed by a likelihood-based statistical treatment to derive projected sensitivities for each operator. For an integrated luminosity of $100 {fb}^{- 1}$ , the projected constraints improve upon current LHC bounds on the corresponding effective couplings by approximately an order of magnitude. Projections for $1 {ab}^{- 1}$ indicate even stronger sensitivity, indicating improved reach at higher luminosity. Additionally, we explore the impact of initial-state beam polarization on these projections, showing how it can further enhance sensitivity to specific operator structures.

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Phys. Rev. D 113, 095010– Published 5 May, 2026

Vol. 113, Iss. 9 — 1 May 2026

Received 5 December 2025
Accepted 20 April 2026

DOI: https://doi.org/10.1103/jnnt-6t8f

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Lepton flavor violating top quark FCNC processes at the $μ TRISTAN$

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Lepton flavor violating top quark FCNC processes at the μTRISTAN

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Lepton flavor violating top quark FCNC processes at the $μ TRISTAN$