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Quantum chromodynamics
English Wikipedia - The Free Encyclopedia
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Quantum chromodynamics
In
theoretical physics
,
quantum chromodynamics
(
QCD
) is the theory of
strong interactions
, a
fundamental force
describing the interactions between
quarks
and
gluons
which make up
hadrons
such as the
proton
,
neutron
and
pion
. QCD is a type of
quantum field theory
called a
non-abelian gauge theory
with symmetry group
SU(3)
. The QCD analog of electric charge is a property called
color
. Gluons are the
force carrier
of the theory, like photons are for the electromagnetic force in
quantum electrodynamics
. The theory is an important part of the
Standard Model
of
particle physics
. A large body of experimental evidence for QCD has been gathered over the years.
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