MUONS
Recent Muon g-2 experiment (conducted by US Department of Energy) showed that behaviour of fundamental particles called muons is different from what is predicated in the Standard Model of particle physics.
o The Standard Model is a rigorous theory that lays out the rules for six types of quarks, six leptons, the Higgs boson, three fundamental forces, and how the subatomic particles behave under the influence of electromagnetic forces.
Muon is sub atomic particle and is classified as one of the leptons (elementary particles).
It is about 200 times more massive than electron and much more unstable, surviving for a fraction of a second.