Abstract
A measurement of charged hadron pair correlations in two-dimensional Delta eta Delta phi space is presented. The analysis is based on total 30 million central Be + Be collisions observed in the NA61/SHINE detector at the CERN SPS for incident beam momenta of 19A, 30A, 40A, 75A, and 150A text {Ge} text {V}/c. Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The C(Delta eta ,Delta phi ) correlation functions were compared with results from a similar analysis on p + p interactions at similar beam momenta per nucleon. General trends of the back-to-back correlations are similar in central Be + Be collisions and p + p interactions, but are suppressed in magnitude due to the increased combinatorial background. Predictions from the Epos and UrQMD models are compared to the measurements. Evolution of an enhancement around (Delta eta ,Delta phi ) = (0,0) with incident energy is observed in central Be + Be collisions. It is not predicted by both models and almost non-existing in proton–proton collisions at the same momentum per nucleon.
Highlights
Introduction and motivationThis paper presents experimental results on two-particle correlations in pseudorapidity and azimuthal angle of charged particles produced in central Be + Be collisions at 19A, 30A, 40A, 75A, and 150 A GeV/c
This paper reports NA61/SHINE results from the step in size of the collision system of two-particle correlations in η and φ for the 5% most central 7Be + 9Be collisions
The C( η, φ) correlation function was studied by the NA61/SHINE experiment in the 0–5% most central Be + Be collisions for a range of different incident beam momenta: 19A, 30A, 40A, 75A, and 150A GeV
Summary
Introduction and motivationThis paper presents experimental results on two-particle correlations in pseudorapidity and azimuthal angle of charged particles produced in central Be + Be collisions at 19A, 30A, 40A, 75A, and 150 A GeV/c. The measurements were performed by the multi-purpose NA61/SHINE [1] experiment at the CERN Super Proton Synchrotron (SPS). They are part of the strong interactions programme devoted to the study of the properties of the onset of deconfinement and search for the critical point of strongly interacting matter. Within this program a two-dimensional scan in collision energy and size of colliding nuclei recorded data on p + p, Be + Be, Ar + Sc, Xe + La, and Pb + Pb collisions and was completed in 2018. The two-particle correlation analysis in pseudorapidity (η) and azimuthal angle (φ) allows to disentangle different correlation sources which may be directly connected with phenomena like jets, collective flow, resonance decays, quantum statistics effects, conservation laws, etc
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