Up-quark

Key Stage 5

Meaning

An up-quark (u) is a type of quark with a charge of \(+\frac{2}{3}\).

About Up-quarks

The up-quark is denoted with a lower case u.

There are two up-quarks in a proton and only one up-quark in a neutron.

Quark	Charge/e	Strangeness	Baryon Number	Lepton Number
Up-quark	\(Q=+\frac{2}{3}\)	\(S=0\)	\(B=+\frac{1}{3}\)	\(L=0\)
Antiup-quark	\(Q=-\frac{2}{3}\)	\(S=0\)	\(B=-\frac{1}{3}\)	\(L=0\)