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The down quark is a first-generation quark with a charge of -(1/3)e. It is the second-lightest of all quarks. Its bare mass is not well determined, but probably lies between 4 and 8 MeV. According to the Standard Model of particle physics, it and the up quark are the fundamental constituents of the nucleons; the proton contains one down quark and two up quarks, while the neutron contains two down quarks and one up quark. (Note that the majority of the mass in nucleons comes from the energy in the gluon field holding the quarks together, and not the quark masses themselves.)
Hadrons containing down quarks
Some of the hadrons containing down quarks include:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Down_quark". A list of authors is available in Wikipedia.|