Abstract
The observation of charged lepton flavor violation is a clear sign of physics beyond the Standard Model (SM). In this work, we investigate the sensitivity of future lepton colliders to charged lepton flavor violation via on-shell production of bileptons, and compare their sensitivity with current constraints and future sensitivities of low-energy experiments. Bileptons couple to two charged leptons with possibly different flavors and are obtained by expanding the general SM gauge invariant Lagrangians with or without lepton number conservation. We find that future lepton colliders will provide complementary sensitivity to the charged-lepton-flavor-violating couplings of bileptons compared with low-energy experiments. The future improvements of muonium-antimuonium conversion, lepton flavor non-universality in leptonic {\tau} decays, electroweak precision observables and the anomalous magnetic moments of charged leptons will also be able to probe similar parameter space.
Highlights
The observation of neutrino oscillations and nonzero neutrino masses clearly established the existence of a lepton flavor violation in the neutrino sector
We investigate the sensitivity of future lepton colliders to charged lepton flavor violation via on shell production of bileptons and compare their sensitivity with current constraints and future sensitivities of low-energy experiments
We studied the sensitivity of on shell production of a bilepton with charged-lepton-flavor-violating couplings at future lepton colliders and compared it with the current constraints and future sensitivities of other experiments
Summary
The observation of neutrino oscillations and nonzero neutrino masses clearly established the existence of a lepton flavor violation in the neutrino sector. The Large Hadron Collider (LHC) recently improved its limit on the effective τl couplings to the level of ð1–2Þ × 10−3 [15,16] and the proposed Higgs boson factories are expected to be sensitive to CLFV couplings down to the order of 10−4 [13,17] Besides these rare decays, CLFV can be probed through scattering processes at colliders. [26,27] for related studies of electroweak doublet and triplet scalar bileptons, respectively Another promising probe for CLFV is through the on shell production of a bilepton X together with two charged leptons with different flavors, i.e., eþe− → Xll0.
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