Experimental equation of state in pp and pp¯ collisions and phase transition to quark gluon plasma

Multiplicity-dependent pT distributions of identified particles in pp collisions at 7 TeV within the HIJING/ BB¯Pop1, Petrovici2 2018Phys. Rev. C1000View full textAdd to dashboardCite

“…Similar conclusions could be drawn for p T of ID particles versus charged-particle multiplicity, N * in pp collisions [89]. Van Hove [90] and Campanini [91] suggested that an anomalous behavior of average transverse momentum ( p T ) as a function of multiplicity could be a signal for the occurrence of a phase transition in hadronic matter, i.e., formation of a mini quark-gluon plasma (mQGP). The long-range near-side ridge in particle correlations observed in high-multiplicity events [1][2][3][4], collective flow [5][6][7], and strangeness enhancement [8] were evidenced in pp collisions at the LHC energies and support such a hypothesis.…”

Bose-Einstein correlations of charged hadrons in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV

“…ref. [59], the authors claim that their compilation of R inv values as a function of dN tracks /dη for data from several experiments at different center-of-mass energies shows a common behaviour that is independent of the energy. In particular, for R inv obtained by CMS [3] and ALICE [14], they claim that a linear function in (dN tracks /dη) 1/3 for dN tracks /dη > 7.5, matched with a fifth degree polynomial for smaller dN tracks /dη values, fits the data better than a single function of (dN tracks /dη) 1/3 over the entire range.…”

“…Data for R inv and average particle transverse momentum p T versus multiplicity were investigated in ref. [59] to deduce approximate equations of state from experimental measurements in pp and pp collisions and search for possible signatures of the phase transition from hadrons to the QGP. A phase transition would cause a change in slope for both observables in the same region of multiplicity per unit pseudorapidity (dN tracks /dη).…”

PACIAE model capability in describing net proton moments

“…[7]. Evidences of crossover from the hadron gas to the quark gluon plasma (QGP) are suggested at p + p and p +p collisions [8]. In this work we aim to explore the capability of the parton and hadron cascade model, PACIAE 2.0, in describing the moments and moment products of net proton in p + p collisions from RHIC energy up to LHC energy.…”