Lepton flavor violating top quark FCNC at the μTRISTAN

2025/06/22 by Sarkar, Abhik
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2506.18015

Abstract

We investigate charged lepton flavor violating top quark flavor-changing neutral current interactions at the proposed asymmetric muon-electron collision stage of the μTRISTAN collider, operating at a center-of-mass energy of 346 GeV. Specifically, we study the process μ⁺ e^- → t q (t q + tq) 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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Related

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