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Introduction to Charged Lepton Flavour Violation

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arxiv 2204.08220 v3 pith:BSZTGWXO submitted 2022-04-18 hep-ph hep-ex

Marco Ardu , Gianantonio Pezzullo This is my paper
classification hep-phhep-ex
keywords violationchargedclfvexperimentsflavourleptonbestcurrent
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Neutrino masses provide evidence of lepton flavour violation, but no violation in the interactions among the charged leptons has been observed yet. Many models of Physics Beyond the Standard Model (BSM) predict Charged Lepton Flavour Violation (CLFV) in a wide spectrum of processes with rates in reach of upcoming experiments. The experimental searches that provide the current best limits on the CLFV searches are reviewed, with a particular emphasis on the muon-based experiments that give the most stringent constraints on BSM parameter space. The next generation of muon-based experiments (MEG-II, Mu2e, COMET, Mu3e) aim to reach improvements by many orders of magnitude w.r.t. the current best limits, thanks to several technological advancements. We review popular heavy BSM theories, and we present the calculations of the predicted CLFV branching ratios, focusing on the more sensitive $\mu\to e$ sector.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. ALP production in Lepton Flavour Violating meson, tau and gauge boson decays

    hep-ph 2026-04 unverdicted novelty 6.0 of 10

    ALPs with LFV couplings above the muon mass threshold can be produced in LFV meson, tau, and gauge boson decays, yielding clean eμ signatures that enable new searches at future experiments.

  2. Lepton flavor violating decay of true muonium: $\boldsymbol{(\mu^+ \mu^-) \to \mu^\pm e^\mp}$

    hep-ph 2025-07 conditional novelty 6.0 of 10

    True muonium could decay into a muon and an electron with branching ratio up to 10^-20, giving a new probe of charged lepton flavor violation.

  3. Polarization Probes of New Physics in Lepton-Flavor-Violating Hyperon Production from $e^- N \to \tau^- Y$ Scattering

    hep-ph 2025-06 conditional novelty 4.0 of 10

    Polarization asymmetries in e-N to tau-Y scattering could distinguish hyperon form factor models and the chiral nature of new lepton-flavor-violating vector interactions, but predicted rates are at most a few hundred ...

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