Do we see change of phase in proton-proton collisions at the Large   Hadron Collider?
  High multiplicity events in proton-proton collisions at the Large Hadron Collider exhibit features resembling those found in relativistic nuclear collisions, indicating formation of medium of similar nature. Analyzing the proton-proton collision data, we find a clear signal of occurrence of change in phase between thermalized partonic matter and hadronic one as has been predicted by the lattice quantum chromodynamics. 
Premomoy Ghosh, Sanjib Muhuri
hep-ph nucl-th