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Lepton flavor violation with displaced vertices

par Heeck, Julian ;Rodejohann, Werner WR
Référence Physics letters. Section B, 776, page (385-390)
Publication Publié, 2018-01

Article révisé par les pairs

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Résumé :

If light new physics with lepton-flavor-violating couplings exists, the prime discovery channel might not be ℓ→ℓ′γ but rather ℓ→ℓ′X, where the new boson X could be an axion, majoron, familon or Z′ gauge boson. The most conservative bound then comes from ℓ→ℓ′+inv, but if the on-shell X can decay back into leptons or photons, displaced-vertex searches could give much better limits. We show that only a narrow region in parameter space allows for displaced vertices in muon decays, μ→eX,X→γγ,ee, whereas tauon decays can have much more interesting signatures.