In particle physics hexaquarks are a large
family of hypothetical particles, each particle
consisting of six quarks or antiquarks of
any flavours.
Six constituent quarks in any of several combinations
could yield a colour charge of zero; for example
a hexaquark might contain either six quarks,
resembling two baryons bound together (a dibaryon),
or three quarks and three antiquarks.
Once formed, dibaryons are predicted to be
fairly stable by the standards of particle
physics.
In 1977 Robert Jaffe proposed that a possibly
stable H dibaryon with the quark composition
udsuds could notionally result from the combination
of two uds hyperonsA number of experiments
have been suggested to detect dibaryon decays
and interactions.
In the 1990s several candidate dibaryon decays
were observed but they were not confirmed.There
is a theory that strange particles such as
hyperons and dibaryons could form in the interior
of a neutron star, changing its mass–radius
ratio in ways that might be detectable.
Accordingly, measurements of neutron stars
could set constraints on possible dibaryon
properties.
A large fraction of the neutrons in a neutron
star could turn into hyperons and merge into
dibaryons during the early part of its collapse
into a black hole.
These dibaryons would very quickly dissolve
into quark–gluon plasma during the collapse,
or go into some currently unknown state of
matter.
In 2014 a potential dibaryon was detected
at the Jülich Research Center at about 2380
MeV.
The particle existed for 10−23 seconds and
was named d*(2380).
== See also ==
Exotic hadron
Deuteron, the only known stable composite
particle that consist of six quarks.
Diproton, an extremely unstable dibaryon.
Dineutron, another extremely unstable dibaryon.
Pentaquark
