Encyclopedia : U : UP : UPQ (2 articles)

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Up quark
The up quark is a first-generation quark with a charge of +(2/3)e. It is the lightest of all quarks, with a bare mass of between 1.5 and 4 MeV. According to the Standard Model of particle physics, it and the down quark are the fundamental constituents of the nucleons; the proton contains two up qu..

 

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