Pseudo-rapidity fluctuations revisited on event-by-event basis: Dependence on centrality of collisions

Abstract

A study of event-by-event pseudo-rapidity fluctuations of the produced shower particles in terms of the Φ values has been carried out for 22 Ne-emulsion interactions at 4.1 A GeV/c and 28 Si-emulsion interactions at 4.5 A GeV/c at different centrality of collision. In order to extract true dynamical fluctuations experimental results have been compared with the results obtained from the analysis of Monte Carlo simulated (MC-RAND) events. The study reflects that Φ despite being strongly intensive shows centrality dependence.

An outlook to centrality dependence of event-by-event fluctuations of maximum pseudo-rapidity gap

“…The scanning process, fading of tracks, insensitivity of nuclear emulsion, presence of background contaminations, and detection of shower particles are the main sources of systematic errors in nuclear emulsion detectors. It may be mentioned here that we provided a thorough study of systematic errors in our earlier articles [34,39,53] and we are not repeating it in details again. The total contribution of systematic errors resulting from the scanning process, fading of tracks, and the existence of background contaminations has been explored in our prior studies and was estimated to be between 1% and 2% [53].…”

“…It may be mentioned here that we provided a thorough study of systematic errors in our earlier articles [34,39,53] and we are not repeating it in details again. The total contribution of systematic errors resulting from the scanning process, fading of tracks, and the existence of background contaminations has been explored in our prior studies and was estimated to be between 1% and 2% [53]. The wrongly measured value of Q which contributes to the possible centrality class misidentification is also a source of systematic error.…”

“…Centrality will gradually decrease as the value of Q increases. Several authors have investigated different aspects of central collisions using emulsion data in different works in the literature using Heckman criteria [46][47][48][49][50][51][52][53]. Now one point should be mentioned here.…”