Down-quark

Key Stage 5

Meaning

An down-quark is a type of quark with a charge of \(-\frac{1}{3}\).

About Up-quarks

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

Properties of the down-quark.

Quark	Charge/e	Strangeness	Baryon Number	Lepton Number
Down-quark	\(q=-\frac{1}{3}\)	\(S=0\)	\(b=+\frac{1}{3}\)	\(l=0\)
Antidown-quark	\(q=+\frac{1}{3}\)	\(S=0\)	\(b=-\frac{1}{3}\)	\(l=0\)