Model Predictions of Charged-Particle Azimuthal Distributions and Forward-Backward Correlations in pp Interactions at root s=900 GeV

摘要

We report inelastic interactions of protons at the center of mass energy root s = 900 GeV, by using different event generators to study the forward-backward (FB) correlation in summed transverse momentum and multiplicity of produced charged particles. The transverse momentum, p(T) >= 100 MeV, and pseudorapidity, vertical bar eta vertical bar < 2.5, have been employed for both the correlations. The simulation results are compared with the ATLAS experimental data, obtained with the same values of vertical bar eta vertical bar and p(T) at root s = 900 GeV. We also measure the jet and jet-like structure as a function of azimuthal distributions in the events relative to the highest transverse momentum particle. Three overlapping regions of pseudorapidity, vertical bar eta vertical bar < 1.0, vertical bar eta vertical bar < 2.0, and vertical bar eta vertical bar < 2.5 are used with transverse momentum, p(T) > 500 MeV. For FB correlations, EPOS, and Sybill2.3c results are in a good agreement with the data as compared to the other models. Similarly, for the azimuthal distribution, EPOS-LHC, DPMJETIII, and Sibyll2.3c show good agreement with the data for full eta region. In general, EPOS provides a better description of the data for both the quantities studied in this paper.