Ordinary baryons are bound states of 3 quarks. Exotic baryons are bound states of 3 quarks and additional particles. These additional particles can be quarks. The pentaquark, which consists of four quarks and an anti-quark, is the only exotic baryon that has (allegedly) been detected. Another exotic baryon which consists only of quarks is the H di-baryon^{[1] [2]}. The H di-baryon consists of two up quarks, two down quarks and two strange quarks. Unlike the pentaquark, this particle can be long lived or even stable. In particle physics, the baryons are a family of subatomic particles including the proton and the neutron (collectively called nucleons), as well as a number of unstable, heavier particles (called hyperons). ... 1974 discovery photograph of a possible charmed baryon, now identified as the Σc++ In particle physics, quarks are subatomic particles thought to be elemental and indivisible. ... A pentaquark is a subatomic particle consisting of a group of five quarks (compared to three quarks in normal baryons and two in mesons), or more specifically four quarks and one anti-quark. ...

Several types of exotic baryons which require physics beyond the standard model have been conjectured in order to explain specific experimental anomalies. There is no independent experimental evidence for any of these particles. One example is supersymmetric R-baryons^[3], which are bound states of 3 quarks and a gluino. The lightest R-baryon is denoted as S⁰ and consists of an up quark, a down quark, a strange quark and a gluino. This particle is expected to be long lived or stable and has been invoked to explain ultrahigh energy cosmic rays^{[4] [5]}. Stable exotic baryons are also candidates for strongly interacting dark matter. In particle physics, supersymmetry is a hypothetical symmetry that relates bosons and fermions. ... A gluino is a subatomic particle, the fermion superpartner of the gluon predicted by supersymmetry. ... In astrophysics SIMP is an abbreviation of Strongly Interacting Massive Particle. ...

References

1. ^  R. Jaffe, Perhaps a stable dihyperon..., Phys. Rev. Lett. 38, 195 (1977).
2. ^  G. R. Farrar and G. Zaharijas, Nuclear and nucleon transitions of the H di-baryon, Phys. Rev. D 70, 014008 (2004) preprint.
3. ^  G. R. Farrar, Detecting Gluino-Containing Hadrons, Phys. Rev. Lett. 76, 4111 (1996) preprint.
4. ^  D. Chung, G. R. Farrar and E. W. Kolb, Are ultrahigh energy cosmic rays signals of supersymmetry?, Phys. Rev. D 57, 4606 (1998) preprint.
5. ^ I. F. M. Albuquerque, G. Farrar and E. W. Kolb, Exotic massive hadrons and ultra-high energy cosmic rays, Phys. Rev. D 59, 015021 (1999) preprint.