Editing Quark star (section)

==Other hypothesized quark formations==
{{more citations needed|section|date=December 2015}}
Apart from ordinary quark matter and strange quark matter, other types of [[Quark–gluon plasma|quark-gluon plasma]] might hypothetically occur or be formed inside neutron stars and quark stars. This includes the following, some of which has been observed and studied in laboratories:

* Robert L. Jaffe 1977, suggested a [[tetraquark|four-quark]] state with strangeness (qs{{overline|qs}}).
* Robert L. Jaffe 1977 suggested the H [[dibaryon]], a six-quark state with equal numbers of up-, down-, and strange quarks (represented as uuddss or udsuds).
* Bound multi-quark systems with heavy quarks (QQ{{overline|qq}}).
* In 1987, a [[pentaquark]] state was first proposed with a charm anti-quark (qqqs{{overline|c}}).
* Pentaquark state with an antistrange quark and four light quarks consisting of up- and down-quarks only (qqqq{{overline|s}}).
* Light pentaquarks are grouped within an antidecuplet, the lightest candidate, Θ<sup>+</sup>, which can also be described by the diquark model of Robert L. Jaffe and Wilczek ([[Quantum chromodynamics|QCD]]).
* [[pentaquark|Θ]]<sup>++</sup> and antiparticle {{overline|Θ}}<sup>−−</sup>.
* Doubly strange pentaquark (ssdd{{overline|u}}), member of the light pentaquark antidecuplet.
* Charmed pentaquark Θ<sub>c</sub>(3100) (uudd{{overline|c}}) state was detected by the H1 collaboration.<ref name="H1">{{cite journal |author1=H1 Collaboration |doi=10.1016/j.physletb.2004.03.012 |journal=Physics Letters B |last2=Aktas |first2=A. |last3=Andreev |first3=V. |last4=Anthonis |first4=T. |last5=Asmone |first5=A. |last6=Babaev |first6=A. |last7=Backovic |first7=S. |last8=Bähr |first8=J. |last9=Baranov |first9=P. |display-authors=6 |title=Evidence for a narrow anti-charmed baryon state of mass |volume=588 |issue=1–2 |pages=17–28 |year=2004 |arxiv=hep-ex/0403017 |bibcode=2004PhLB..588...17A |s2cid=119375207 }}</ref>
* Tetraquark particles might form inside neutron stars and under other extreme conditions. In 2008, 2013 and 2014 the tetraquark particle of [[Z(4430)]], was discovered and investigated in laboratories on [[Earth]].<ref>{{cite web |url=http://www.universetoday.com/111110/how-cerns-discovery-of-exotic-particles-may-affect-astrophysics |title=How CERN's discovery of exotic particles may affect astrophysics |last=Koberlein |first=Brian |publisher=Universe Today |date=10 April 2014 |access-date=14 April 2014 |archive-date=14 April 2014 |archive-url=https://web.archive.org/web/20140414053520/http://www.universetoday.com/111110/how-cerns-discovery-of-exotic-particles-may-affect-astrophysics/ |url-status=live }}/</ref>