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Glueball
In
particle physics
, a
glueball
(or
gluonium
) is a hypothetical composite
particle
. It consists solely of
gluon
particles, without valence
quarks
. Such a state is possible because gluons carry
color charge
and experience the
strong interaction
. Glueballs are extremely difficult to identify in
particle accelerators
, because they
mix
with ordinary
meson
states.
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