| − | A '''muon''' is a fundamental constituent of [[matter]]. Its properties are similar to those of the more-familiar [[electron]], but it is roughly 206 times more massive. Muons belong to a category of elementary particle known as [[lepton]]s. | + | A '''muon''' is a fundamental constituent of [[matter]]. Its properties are similar to those of the more-familiar [[electron]], but it is roughly 206 times more massive. Muons belong to a category of elementary particles known as [[lepton]]s. |