Pion Production Via Resonance Decay in a Non-extensive Quark-Gluon   Medium with Non-additive Energy Composition Rule
  Resonance production and decay into pion pairs is simulated in a non-extensive quark matter with multi-particle interactions. Final state pion spectra are found to take the form of the Tsallis distribution, in accordance with measurements. It has also been shown that, if a large number of particles with these multi-particle interactions are constrained to a constant energy hyper-surface in phase space, the one-particle distribution is the Tsallis distribution. 
Karoly Urmossy and Tamas S. Biro and Gergely G. Barnaf\"oldi
hep-ph