Azimuthal dependence of pion source radii in Pb+Au collisions at 158 A GeV
CERES Collaboration: D. Adamova, G. Agakichiev, A. Andronic, D., Antonczyk, H. Appelshaeuser, V. Belaga, J. Bielcikova, P. Braun-Munzinger, O., Busch, A. Cherlin, S. Damjanovic, T. Dietel, L. Dietrich, A. Drees, W., Dubitzky, S. I. Esumi, K. Filimonov, K. Fomenko, Z. Fraenkel
TL;DR
This paper analyzes two-pion correlations in Pb+Au collisions at 158 A GeV, revealing a slightly elongated pion source perpendicular to the reaction plane, consistent with observations at other energies.
Contribution
It provides new measurements of azimuthal dependence of pion source radii in Pb+Au collisions at SPS energies, extending previous findings from AGS and RHIC.
Findings
Pion source is slightly elongated perpendicular to the reaction plane.
Results are consistent with similar observations at AGS and RHIC.
Analysis performed across different centrality and azimuthal bins.
Abstract
We present results of a two-pion correlation analysis performed with the Au+Pb collision data collected by the upgraded CERES experiment in the fall of 2000. The analysis was done in bins of the reaction centrality and the pion azimuthal emission angle with respect to the reaction plane. The pion source, deduced from the data, is slightly elongated in the direction perpendicular to the reaction plane, similarly as was observed at the AGS and at RHIC.
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