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Type: Artigo de periódico
Author: Dash, AK
Mahapatra, DP
Mohanty, B
Abstract: Forward-backward correlation strength (b) as a function of pseudorapidity intervals for experimental data from p + p nonsingly diffractive collisions are compared to PYTHIA and PHOJET model calculations. The correlations are discussed as a function of rapidity window (Delta eta) symmetric about the central rapidity as well as rapidity window separated by a gap (eta(gap)) between forward and backward regions. While the correlations are observed to be independent of Delta eta, it is found to decrease with increase in eta(gap). This reflects the role of short range correlations and justifies the use of eta(gap) to obtain the accurate information about the physics of interest, the long range correlations. The correlation strength from PYTHIA are in agreement with the available experimental data while those from the PHOJET give higher values. For p + p collisions at root s = 7, 10 and 14 TeV, the correlation strength from PHOJET are lower compared to those from PYTHIA, this is in contrast to the observations at lower energies. The experimental b value shows a linear dependence on In vs with the maximum value of unity being reached at root s = 16 TeV, beyond the top LHC energy. However calculations from the PYTHIA and PHOJET models indicate a deviation from linear dependence on ln vs and saturation in the b values being reached beyond root s = 1.8 TeV. Such a saturation in correlation values could have interesting physical interpretations related to clan structures in particle production. Strong forward-backward correlations are associated with cluster production in the collisions. The average number of charged particles to which the clusters fragments, called the cluster size, are found to also increase linearly with ln root s for both data and the models studied. The rate of increase in cluster size versus ln root s from models studied are larger compared to those from the data and higher for PHOJET compared to PYTHIA. Our study indicates that the forward-backward measurements will provide a clear distinguishing observable for the models studied at LHC energies.
Subject: Forward-backward correlations
long range correlations
cluster formation
p plus p collisions at LHC
Country: Singapura
Editor: World Scientific Publ Co Pte Ltd
Citation: International Journal Of Modern Physics A. World Scientific Publ Co Pte Ltd, v. 27, n. 14, 2012.
Rights: fechado
Identifier DOI: 10.1142/S0217751X12500790
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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