Formulation of charged-particle pseudorapidity distribution in Au-Au collisions at the maximum RHIC energy

Abstract

The pseudorapidity distributions of charged particles produced in relativistic heavy-ion collider experiment are analyzed by the thermalized two-cylinder model. The calculated results are compared and found to be in agreement with the experimental data of Au-Au collisions at the maximum RHIC energy (the energy in the center-of-mass reference frame is √ s = 200A GeV) which is the maximum energy in the present accelerator energy region.

Widths of charged particle pseudorapidity density distributions in high energy and AA collisions

“…The following discussions are based on the two-cylinder model [39][40][41]. According to the model, in high energy collisions, a projectile cylinder and a target cylinder are expected to be formed along the direction of incident projectile due to the projectile and target nuclei penetrating through each other.…”

“…However, the Monte Carlo calculation of this model was treated containing the particle mass [39][40][41]. The various parameter sets for produced pions and non-leading protons obtained from the Monte Carlo calculation are consistent.…”

“…The various parameter sets for produced pions and non-leading protons obtained from the Monte Carlo calculation are consistent. Introducing a parameter "temperature" and considering the particle mass [39][40][41], we can use the results of produced pions measurement to predict the results of non-leading protons. In the Monte Carlo calculation of this model [39][40][41], parameter values obtained from produced pions distribution are equal to those obtained from non-leading protons distribution.…”

Dependence of charged particle pseudorapidity distributions on centrality and energy inp(d)Acollisions at high energies

“…According to the two-cylinder model [32][33][34], in high energy collisions, a projectile cylinder and a target cylinder are expected to be formed along the direction of the incident projectile. By convention, in the rapidity space, the projectile cylinder is assumed to be in the positive rapidity region and the target cylinder in the negative rapidity region.…”

“…In the past decade, we have suggested a thermalized cylinder model [29][30][31] and developed it into the two-cylinder model [32][33][34]. Based on these models, we have given in a recent work [35] a semiempirical formula that described the (pseudo)rapidity distributions of charged particles produced in symmetrical nuclear collisions at high energies [36].…”