Down-quark

Key Stage 5

Meaning

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

About Down-quarks

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

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