Dibaryon
Encyclopedia
Dibaryons are a large family of hypothetical particle
s that would consist of six quark
s of any flavour
s. They are predicted to be fairly stable once formed. Robert Jaffe
proposed the existence of a possibly stable H dibaryon (with the quark
composition udsuds), made by combining two uds hyperon
s, in 1977.
A number of experiments have been suggested to detect dibaryon decays and interactions. Several candidate dibaryon decays were observed but not confirmed in the 1990s.
There is a theory that strange particles such as hyperons and H dibaryons could form in the interior of a neutron star
, changing its mass-radius ratio in ways that might be detectable. Conversely, measurements of neutron stars set constraints on possible dibaryon properties. Theory suggests that a large fraction of neutrons could turn into hyperons and merge into dibaryons during the early part of a neutron star to black hole collapse . These dibaryons would very quickly dissolve into quark-gluon plasma
during the collapse, or go into some currently unknown state of matter.
Bound state
In physics, a bound state describes a system where a particle is subject to a potential such that the particle has a tendency to remain localised in one or more regions of space...
s that would consist of six quark
Quark
A quark is an elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. Due to a phenomenon known as color confinement, quarks are never directly...
s of any flavour
Flavour (particle physics)
In particle physics, flavour or flavor is a quantum number of elementary particles. In quantum chromodynamics, flavour is a global symmetry...
s. They are predicted to be fairly stable once formed. Robert Jaffe
Robert Jaffe
Robert L. Jaffe is an American physicist and the Jane and Otto Morningstar Professor of Physics at the Massachusetts Institute of Technology . He was formerly director of the MIT Center for Theoretical Physics.-Biography:...
proposed the existence of a possibly stable H dibaryon (with the quark
Quark
A quark is an elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. Due to a phenomenon known as color confinement, quarks are never directly...
composition udsuds), made by combining two uds hyperon
Hyperon
In particle physics, a hyperon is any baryon containing one or more strange quarks, but no charm quarks or bottom quarks.-Properties and behavior of hyperons:...
s, in 1977.
A number of experiments have been suggested to detect dibaryon decays and interactions. Several candidate dibaryon decays were observed but not confirmed in the 1990s.
There is a theory that strange particles such as hyperons and H dibaryons could form in the interior of a neutron star
Neutron star
A neutron star is a type of stellar remnant that can result from the gravitational collapse of a massive star during a Type II, Type Ib or Type Ic supernova event. Such stars are composed almost entirely of neutrons, which are subatomic particles without electrical charge and with a slightly larger...
, changing its mass-radius ratio in ways that might be detectable. Conversely, measurements of neutron stars set constraints on possible dibaryon properties. Theory suggests that a large fraction of neutrons could turn into hyperons and merge into dibaryons during the early part of a neutron star to black hole collapse . These dibaryons would very quickly dissolve into quark-gluon plasma
Quark-gluon plasma
A quark–gluon plasma or quark soup is a phase of quantum chromodynamics which exists at extremely high temperature and/or density. This phase consists of asymptotically free quarks and gluons, which are several of the basic building blocks of matter...
during the collapse, or go into some currently unknown state of matter.