"charm quark." YourDictionary, n.d. Web. 12 November 2018. <https://www.yourdictionary.com/charm-quark>.
charm quark. (n.d.). Retrieved November 12th, 2018, from https://www.yourdictionary.com/charm-quark
A quark with a charge of +2/3 and a charm of +1. Its mass is greater than that of the electron and greater than that of the up quark, down quark, and strange quark, but less than that of the bottom quark and top quark. Also called charmed quark