Centrality definition using mid-rapidity et distributions from p+be to au+au at ags energies

摘要

Measurements by the E802 Collaboration of the A-dependence and pseudorapidity interval ((delta)(eta)) dependence of mid-rapidity ET distributions in a half-azimuth electromagnetic calorimeter are presented for p+Be, p+Au, O+Cu, Si+Au and Au+Au collisions at the BNL-AGS. The issues addressed are (1) whether the shapes of the upper edges of the ET distributions vary with (delta)(eta) similarly to the variation in shapes of mid-rapidity charged particle distributions and (2) how small a (delta)(eta) interval would still give a meaningful characterization of the 'nuclear geometry' of a reaction. A new way of plotting ET distributions was found from which the reaction dynamics could be read directly.