Intermittency in the Slow Particle Emission During Hadron–Nucleus Interactions (original) (raw)

Slow Particle Production in Nucleus-Nucleus Collisions at Relativistic Energies

In this paper an effort has been made to study the general characteristics of slow particles produced in the interactions of 32S-Em at 200 AGeV to extract the information about the mechanism of particle production. The results have been compared with the experimental results obtained by other workers. The multiplicity distributions of the slow target associated particles (black, grey and heavy tracks) produced by 32S-beam with different targets have been studied. Also several types of correlations among them have been investigated. The variation of the produced particles with projectile mass number and target size has been studied. Also the multiplicity distributions of slow particles with NBD fits are presented and scaling multiplicity distributions of slow particles produced have been studied in order to check the validity of KNO-scaling.

Extended Statistical Thermal Model and Rapidity Spectra of Hadrons at 200 GeV/A

2009

We use the extended statistical thermal model to describe various hadron rapidity spectra at the highest RHIC energy (200 GeV/A). The model assumes the formation of hot and dense regions moving along the beam axis with increasing rapidities, yFB. It has been earlier shown that this model can explain the net proton flow i.e. p minus pbar, ratio pbar/p and the pion rapidity spectra. In this paper we have attempted to show that in addition to these quantities, this model can also successfully describe the individual rapidity spectra of protons, antiprotons, Kaons, antiKaons, pions, the ratios lambdabar/lambda and cascadebar/cascade. The experimental data set on p, pbar, K, Kbar and Pion provided by BRAHMS collaboration at the highest energy of Relativistic Heavy Ion Collider, sqrt(SNN) = 200 GeV are used. The theoretical results fit quite well with mid-rapidity data (for y < 1) of the lambdabar/lambda and the cascadebar/cascade ratios available (from STAR). We have used single set of model parameters including single value of the temperature parameter T for all the regions of the hot and dense matter formed. The chemical potentials are however assumed to be dependent on the fireball rapidity yFB. We have analyzed the contribution of the decay of the heavier resonances to the proton (antiproton) rapidity spectra. It is found that the rapidity spectrum of the product hadron is nearly same as that of the parent hadron. We have also imposed the criteria of exact strangeness conservation in every (local) region of the dense matter separately, which is necessary. We also discuss what can be learned about the nuclear transparency effect at the highest RHIC energy from the net proton rapidity distribution.