Abstract
Charged-particle multiplicity and summed values of the transverse momentum ($p_{\rm T}$) have been utilized for estimating forward-backward (FB) correlation strength for EPOS3 simulated proton-proton ($pp$) events with and without hydrodynamical evolution of particles at center-of-mass energies $\sqrt{s}$ = 0.9, 2.76, and 7 TeV for different pseudorapidity window width ($\delta\eta$) and gap ($\eta_{gap}$) between the FB windows. We have studied the variation of FB correlation strength with $\eta_{gap}$, $\delta\eta$, $\sqrt{s}$, $p_{\rm T}$ cuts and multiplicity classes. Results are compared with the corresponding ALICE and ATLAS data. EPOS3 model qualitatively reproduces the overall variation of correlation strength of the LHC data. However, quantitative agreement is better for $pp$ events, generated using EPOS3 with hydrodynamical evolution of particles, with ATLAS data.
Highlights
In ultrarelativistic high-energy collisions, the study of correlations between produced particles in different pseudorapidity (η) regions gives us an opportunity to understand the dynamics of multiparticle interactions and their hadronization
These correlations are of two types: short-range correlations (SRCs) and long-range correlations (LRCs) [1,2,3,4]
There was no FB multiplicity correlation found in eþe− annihilation [13], but in hadronic collisions or in heavy-ion collisions with higher energies at the Super Proton Synchrotron [1,2,3], the Tevatron [15], the Relativistic Heavy Ion Collider (RHIC) [16,17], and the Large Hadron Collider (LHC) [7,18,19], a considerable correlation strength was observed
Summary
In ultrarelativistic high-energy collisions, the study of correlations between produced particles in different pseudorapidity (η) regions gives us an opportunity to understand the dynamics of multiparticle interactions and their hadronization These correlations are of two types: short-range correlations (SRCs) and long-range correlations (LRCs) [1,2,3,4]. There was no FB multiplicity correlation found in eþe− annihilation [13], but in hadronic collisions (pp=pp ) or in heavy-ion collisions with higher energies at the Super Proton Synchrotron [1,2,3], the Tevatron [15], the Relativistic Heavy Ion Collider (RHIC) [16,17], and the Large Hadron Collider (LHC) [7,18,19], a considerable correlation strength was observed All these experimental observations offer a cornucopia of scopes to testify various theoretical and/or phenomenological models for a possible explanation of the FB correlation exploiting different correlation coefficients between the multiplicities (n − n), the transverse momentums (pT − pT), and the transverse momentum and the multiplicity of charged particles (pT − n).
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