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Up quark


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Very simplified illustrations of protons, neutrons, pions, and other hadrons show that they are made of quarks (yellow spheres) and antiquarks (green spheres), which are bound together by gluons (bent ribbons).
...( u), “down” ( d), and “strange” ( s). Each carries a fractional value of the electron charge (i.e., a charge less than that of the electron, e). The up quark (charge 2/3 e) and down quark (charge − 1/3 e) make up protons and neutrons and are thus the ones...

subatomic particles

...charges for the observed particles, usually 0, + e, or − e. Only two types of quark are necessary to build protons and neutrons, the constituents of atomic nuclei. These are the up quark, with a charge of + 2/3 e, and the down quark, which has a charge of − 1/3 e. The proton consists of two...
The W particles play a crucial role in interactions that turn one flavour of quark or lepton into another, as in the beta decay of a neutron, where a down quark turns into an up quark to form a proton. Such flavour-changing interactions occur only through the weak force and are described by the SU(2) symmetry that underlies electroweak theory along with U(1). The basic representation of this...
up quark
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