Search for the lepton-flavour violating decay Mu -$>$ e + gamma -- Latest results from the MEG Experiment
COFFEE_KLATCH · Invited
Abstract
The first search for the lepton-flavour violating (LFV) decay Mu-$>$e + gamma, using cosmic rays, dates back some sixty years now. This, together with the diversity of such experiments that have followed, shows that the search for ``New Physics'' is not restricted to the high-energy frontier of TeV-scale accelerators but that the high-intensity, precision frontier can complement it. The MEG experiment at PSI is a LFV search experiment aiming at a sensitivity of O(10$^{-13})$ for the decay Mu-$>$e + gamma. By using one of the world's most intense surface muon beams, together with a liquid xenon detector of 900 litres and a gradient-field superconducting positron spectrometer, the two-body decay can be distinguished from the normal Michel and radiative muon decay processes. To resolve the dominant background process of accidental overlapping events, a detector with excellent spatial, temporal and energy resolution is required. The current status of the experiment as well as the latest results will be presented.
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Authors
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Peter-Raymond Kettle
Paul Scherrer Institute PSI