An unstable subatomic particle of the same class as an electron (a lepton), but with a mass around 200 times greater. Muons make up much of the cosmic radiation reaching the Earth’s surface.

The Mu2e experiment: a rare opportunity

15 Jun 2015 | Update - For scientists | Christine Sutton | A new experiment at Fermilab will look for the neutrinoless transformation of a muon into an electron

CMS and LHCb experiments reveal new rare particle decay

12 May 2015 | Update - For the public | The CMS and LHCb experiments at the LHC have observed a very rare decay. An important milestone in the search for hints of new physics

A complete demonstrator of a muon-cooled Higgs factory

13 Apr 2015 | Update - For scientists | At 4pm on 14 April in the CERN auditorium, Carlo Rubbia will review the case for a muon-cooled Higgs factory. Watch the webcast

Watch engineers install a muon detector on CMS

18 Sep 2013 | Update - For the public | Cian O'Luanaigh | Engineers have repaired and reinstalled a part of the CMS detector crucial for identifying muons. Watch them at work

Tracking new physics—horse or zebra?

9 Aug 2013 | Update - For the public | Ashley WennersHerron | When you've got a discrepancy in the data, it might be time for theory and experiment to collaborate

How a detector works

20 Jan 2012 | About section page | Just as hunters can identify animals from tracks in mud or snow, physicists identify subatomic particles from the traces they leave in detectors

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