Transverse momentum analysis of collective motion in relativistic nuclear collisions

Abstract

Novel transverse-momentum technique is used to analyse charged-particle exclusive data for collective motion in the Ar+KCl reaction at 1.8 GeV/nucl. Previous analysis of this reaction, employing the standard sphericity tensor, revealed no significant effect. In the present analysis, collective effects are observed, and they are substantially stronger than in the Cugnon cascade model, but weaker than in the hydrodynamical model.

Preprint version, serving as a reference for another work (14 pages, 3 figures). This version contains, in particular, calculation of second-order azimuthal moments of particle distributions, in the elements of the sphericity tensor, not in the journal. The editor insisted on shortening of the paper, while the referee insisted on additional explanations, so something had to go

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