CLUSTER PRODUCTION IN 14.5A GeV/c Si-NUCLEUS COLLISIONS

Abstract

Characteristics of clusters of relativistic charged secondaries produced in 14.5A GeV/c Si-nucleus collisions are investigated by examining the behaviour of the rapidity gap distribution. The findings reveal that the maximum number of relativistic charged particles constituting a cluster is four. Further, the size of the cluster is observed to remain essentially independent of the mass of the struck nucleus. A comparison of the result of the present study with those reported earlier for hadron-hadron and hadron-nucleus collisions indicates that similar mechanisms may operate in the production of secondary particles in both hadronic and nuclear collisions at high energies.

Event-by-event analysis of high-multiplicity events produced in 158 A GeV/c 208 Pb- 208 Pb collisions

“…A detailed description about the method of analysis may be found in refs. [35]. Using this approach, number of clusters (< m >) in each event with each cluster having at least m particles and number of particles in each cluster are determined for a given value of r are determined.…”

“…This algorithm is somewhat different to that adopted in ref. [35] in which the formation of clusters and their sizes were looked into by histogramming the rapidity differences between the n-th nearest neighbors. The present approach helps searching for high-density regions in the η-φ phase space which provides a clean separation in the η-φ metric in the low-multiplicity and low particle density final states [19].…”

“…A detailed description about the method of analysis may be found in ref. [35]. Using this approach, the number of clusters ( m ) in each event with each cluster having at least m particles and the number of particles in each cluster are determined for a given value of r. It may be mentioned here that for a very small value of r only a few or no clusters would be formed, whereas for a very large value of r, almost all the particles would form one large cluster.…”

Event by Event Analysis of High Multiplicity Events Produced in 158 A GeV/c 208 Pb- 208 Pb Collisions

“…This algorithm is somewhat different to that adopted in ref. [35] in which formation of clusters and their sizes were looked into by histogramming the rapidity differences between the n th nearest neighbors. The present approach helps search for high density regions in η − φ phase space which provides a clean separation in the η − φ metric in the low multiplicity and low particle density final states [19].…”

Search for Long-Range Correlations in Relativistic Heavy-Ion Collisions at SPS Energies

“…Correlations among the relativistic charged particles produced in different pseudorapidity,η bins are considered as a powerful tool for understanding the underlying mechanism of multiparticle production in hadron-hadron(hh), hadron-nucleus(hA) and nucleus-nucleus(A-A) collisions [4,5,6]. Both short-and long-range correlations have been observed in hadronic and heavy-ion collisions at SPS and RHIC energies [5,6,7,8,9,10]. These observed correlations have been interpreted in terms of the concept of clustering [11], that is, the particle production takes place via the formation of some intermediate states, referred to as 'clusters' which finally decay isotropically in their centre-of-mass(c.m.)…”