up quark


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Related to up quark: down quark
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a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron

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References in periodicals archive ?
is also a mixture of one up quark and one down antiquark but has more mass than [[pi].
However, when the new experiment probed valence quarks temporarily laden with up to 60 percent of a neutron's energy, it revealed that only the up quarks behaved as expected.
At the simplest level, a proton consists of three quarks: two up quarks, each with an electric charge of +2/3, and a down quark, with an electric charge of -1/3.
A proton, for example, is made up of two up quarks and one down quark, and a neutron is made up of two down quarks and one up quark.
A neutron consists of one up quark and two down quarks.
The particles' masses, decay products and other data indicated a composition of a charm quark, its antimatter counterpart, two up quarks and a down quark.
Ordinary matter, such as protons and neutrons, contains only up quarks and down quarks, whereas the sigma-bs each contain a bottom quark and either a pair of up quarks or a pair of down quarks.