Evidence of non-thermal phase transition in ultrarelativistic heavy-ion interactions

Abstract

The scaled factorial moment, which is a statistical tool for measuring large local fluctuations of dynamical origin, has been utilized to probe the distribution of secondary particles produced in 16 O-AgBr interactions at 60 GeV/n. The analysis indicates the occurrence of a non-thermal phase transition in case of pionisation in heavy-ion interactions at extremely high energy.

A study on azimuthal asymmetry of emission of pions produced in ultra-relativistic nuclear collisions

“…The data sets used in the present analysis were obtained by irradiating Ilford-G5 emulsion stacks (a) by an 16 O beam with incident energy 60 GeV/nucleon and (b) by an 32 S beam with incident energy 200 GeV/nucleon at CERN, SPS [18,19].…”

Multifractal branching cascades and multiparticle production

“…Now let us look at multiparticle production in heavy-ion collisions from this point of view. In a recent paper [10] the intermittency phenomenon for the distribution of secondary particles produced in 16 O-AgBr interactions at 60 GeV/n was studied using the scaled factorial moments. In fig.…”

“…3 we show the data represented in ref. [10] for the pseudorapidity (filled circles) and for the azimuthal (open circles) phase spaces in the case of largest bin regions. As in the previous figures the axes are chosen for comparison with the stretched lognormal distribution (30) (straight lines, the best fit, are drawn to indicate agreement between the data and representation (30)).…”

“…Fig.3ζp/p vs. p1/3 for the data obtained at ultrarelativistic heavy-ion collisions (for secondary particles produced in 16 O-AgBr interactions at 60 GeV/n)[10]. Filled circles correspond to the pseudorapidity and open circles correspond to the azimuthal phase spaces.…”