Implications of energy and momentum conservation for particle emission in A+A collisions at energies available at the CERN Super Proton Synchrotron

Antoni Szczurek, Mirosław Kiełbowicz, and Andrzej Rybicki
Phys. Rev. C 95, 024908 – Published 23 February 2017

Abstract

We construct a simple model of heavy-ion collisions, local in the impact parameter plane, and appropriate for energies available at the CERN Super Proton Synchrotron (SPS). This model can be regarded as a new realization of the “fire-streak” approach, originally applied to studies of lower-energy nucleus-nucleus reactions. Starting from local energy and momentum conservation, we nicely describe the broadening of the pion rapidity distribution when going from central to peripheral Pb+Pb collisions at sNN=17.3 GeV. The results of our calculations are compared with SPS experimental data. We discuss the resulting implications on the role of energy and momentum conservation for the dynamics of particle production in heavy-ion collisions. A specific space-time picture emerges, where the longitudinal evolution of the system strongly depends on the position in the impact parameter (bx,by) plane. This picture is consistent with our earlier findings on the longitudinal evolution of the system as deduced from electromagnetic effects on charged-pion directed flow and can provide an explanation for specific low-pT phenomena seen in the fragmentation region of Pb+Pb collisions.

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  • Received 2 January 2017

DOI:https://doi.org/10.1103/PhysRevC.95.024908

©2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

Authors & Affiliations

Antoni Szczurek1,2, Mirosław Kiełbowicz1, and Andrzej Rybicki1

  • 1H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland
  • 2University of Rzeszów, Rejtana 16, 35-959 Rzeszów, Poland

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Issue

Vol. 95, Iss. 2 — February 2017

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