Abstract
The existence of the critical point (CP) of strongly interacting matter is still an open problem. An extensive strong interactions program including a search of the CP and the study of the onset of deconfinement was started by the NA61/SHINE experiment at the CERN SPS. A two dimensional scan of the phase diagram is performed to search for the CP and to shed light on the phase transition region. This program includes studies of hadron production in proton- proton, proton-nucleus and nucleus-nucleus interactions measured in a wide range of colliding energy and system size. Correlations between various observables measured at midrapidity as well as in separated rapidity intervals are considered as additional and sensitive tools of this phase diagram scan. We present NA61/SHINE results of studies of energy dependence of two- particle correlations of pseudo-rapidity and azimuthal angle in p+p collisions at the SPS and the first results on correlations between multiplicity and mean transverse momentum in 7Be + 9Be collisions at 150A GeV/c obtained for separated pseudo-rapidity intervals (so called long-range correlations). Comparison with data calculations using the EPOS 1.99 model are also discussed.
Highlights
We present preliminary results of two-particles correlation analysis in p+p collisions and pseudo-rapidity correlations in 7Be + 9Be interactions at 150A GeV/c
All results were calculated inside NA61/SHINE acceptance, the influence of which will be shown in the example of the EPOS 1.99 model in the chapter
Two particles correlations 000000000000000000000000000000000000000000000000000000000 The correlation function C(Δη, Δφ) for p+p collisions of different energies and different charged pair combinations is shown in figure
Summary
1. Introduction We present preliminary results of two-particles correlation analysis in p+p collisions (previously shown in [1], except figure.3) and pseudo-rapidity correlations in 7Be + 9Be interactions at 150A GeV/c. Two-particles correlations are an unique tool to disentangle different sources of correlations. Two particles correlations 000000000000000000000000000000000000000000000000000000000 Such correlations were studied as a function of the difference in pseudo-rapidity Δη = |η1-η2| and azimuthal angle Δφ = |φ1- φ2| between two particles in the same event. The correlation function is calculated as: C(Δη, Δφ)
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