Speaker
Description
Although unobservable in the standard model, charged lepton flavour violating (LVF) processes are predicted to be enhanced in new physics extensions. We present the final results of a search for electron-muon flavour violation in 𝛶(3S) → e±μ∓ decays using data collected with the BaBar detector at the SLAC PEP-II e+e− collider operating with a 10.36 GeV centre-of-mass energy. The search was conducted using a data sample of 118 million 𝛶(3S) mesons from 27 fb−1 of data and is the first search for electron-muon LFV decays of a b quark and b antiquark bound state. No evidence for a signal is found, and we set a limit on the branching fraction of 𝛶(3S) → e±μ∓ and interpret it as a limit on the energy scale divided by the coupling-squared of relevant LFV new physics (NP): ΛNP/gNP2 > 80 TeV.
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