Scientific article
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English

Two-particle correlations in azimuthal angle and pseudorapidity in central 7Be+9Be collisions at the CERN Super Proton Synchrotron

ContributorsNA61/SHINE Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 80, no. 12, 1151
Publication date2020
First online date2020-12-14
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.

Keywords
  • Beam: momentum
  • Correlation: two-particle
  • P p: scattering
  • Dimension: 2
  • Hadron
  • Correlation function
  • Proton synchrotron
  • Suppression
  • Enhancement
  • CERN SPS
  • Rapidity
  • NA61
  • Experimental results
  • 19-150 GeV/nucleon
Citation (ISO format)
NA61/SHINE Collaboration. Two-particle correlations in azimuthal angle and pseudorapidity in central 7Be+9Be collisions at the CERN Super Proton Synchrotron. In: European physical journal. C, Particles and fields, 2020, vol. 80, n° 12, p. 1151. doi: 10.1140/epjc/s10052-020-08675-4
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Article (Published version)
Identifiers
Journal ISSN1434-6044
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