Mu to E Gamma
The Mu to E Gamma (MEG) is a particle physics experiment dedicated to measuring the decay of the muon into an electron and a photon, a decay mode which is heavily suppressed in the Standard Model by lepton flavour conservation, but enhanced in supersymmetry and grand unified theories.[1] It is located at the Paul Scherrer Institute and began taking data September 2008.
MEG use a continues muon beam (3 × 107/s) incident on a plastic target. The decay is reconstructed to look for a back-to-back positron and monochromatic photon (52.8 MeV). A liquid xenon scintillator with PMTs measure the photon energy and a drift chamber in a magnetic field detects the positrons.
In May 2016 the MEG experiment published the world's leading upper limit on the branching ratio of this decay:
at 90% confidence level, [2] based on data collected in 2009–2013. This improved the MEG limit from the prior MEGA experiment[3] by a factor of about 28.
The MEG collaboration presented upgrade plans for MEG-II at the Particles and Nuclei International Conference 2014, with an order more sensitivity and increased muon production to begin data taking in 2017.[4] More experiments are planned that will explore this process such as Mu2e.
External links
References
- ↑ http://cerncourier.com/cws/article/cern/29118
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