Forward-backward multiplicity and momentum correlations in pp and pPb collisions at the LHC energies

Correlations and fluctuations between produced particles in an ultrarelativistic nuclear collisions remain one of the key observables to understand the fundamentals of the particle production mechanism. More differential tools like forward-backward (FB) correlations between particles from two different phase spaces further strengthened our understanding. We study the strength of FB correlations in terms of charged-particle multiplicity and summed transverse momentum for proton-proton (pp) and proton-lead (pPb) collisions at ffiffi center-of-mass energiesp = 13 TeV and ffiffiffiffiffiffiffi sp = 5.02 TeV, respectively, for the EPOS3 simulated events sNN with hydrodynamical evolution of produced particles. Furthermore, the correlation strengths are separately obtained for the particles coming from the core and the corona. FB correlation strengths are examined as a function of the pseudorapidity gap (rigap), pseudorapidity window width (5ri), center-of-mass energy ( minimum transverse momentum (pTmin), and different multiplicity classes following standard kinematical cuts used by the ALICE and ATLAS experiments at the LHC for all three EPOS3 event samples. The EPOS3 model shows a similar trend of FB multiplicity and momentum correlation strengths for both pp and pPb systems, though the correlation strengths are found to be larger for the pPb system than for the pp system. Moreover, the 5ri-weighted average of FB correlation strengths as a function of different center-of-mass energies for pp collisions delineates a tendency of saturation at very high energies. p ), ffiffi s