The proton consists of three quarks, two up and one down, living in a complicated soup of dynamical quarks, antiquarks and gluons, which have ‘colour’ charges.
A single quark will be surrounded by a sea of continuously appearing and annihilating virtual pairs of quarks and antiquarks, and virtual pairs of gluons and antigluons.
A neutral pion consists of a down quark and a down antiquark.
Kaons and pions are examples of particles known as mesons, which contain a quark and an antiquark.
I've labeled the charges as q and q-bar for quark and antiquark, but that's modern terminology that might not have been present in the early days of string theory.
Definition of antiquark in US English:
antiquark
nounˈan(t)ēˌkwärk
Physics
The antiparticle of a quark.
〔物理〕反夸克
Example sentencesExamples
A single quark will be surrounded by a sea of continuously appearing and annihilating virtual pairs of quarks and antiquarks, and virtual pairs of gluons and antigluons.
The proton consists of three quarks, two up and one down, living in a complicated soup of dynamical quarks, antiquarks and gluons, which have ‘colour’ charges.
Kaons and pions are examples of particles known as mesons, which contain a quark and an antiquark.
I've labeled the charges as q and q-bar for quark and antiquark, but that's modern terminology that might not have been present in the early days of string theory.
A neutral pion consists of a down quark and a down antiquark.