$\bar{\hat{I}}›/\bar{p}$ ratios in heavy ion collisions at 11.6 AGeV/c

Abstract

We attempt to explain the $\bar{\hat{I}}›/\bar{p}$ ratios measured in heavy ion collisions at $11.6\mathrm{A}\cdot \mathrm{GeV}/c$ beam momentum within a hadronic framework. This ratio is enhanced relative to corresponding ratios in $pp$ collisions, and is large when compared with thermal fits to heavy ion data. Using a detailed cascade calculation, we show that different annihilation cross--sections of $\bar{\hat{I}}›$'s and $\bar{p}$'s, and the net conversion of $\bar{p}$'s to $\bar{\hat{I}}›$'s, do not account for the enhancement in central collisions. For larger impact parameters, however, hadronic mechanisms may well suffice to produce the observed enhancement. Uncertainties in elementary cross--sections and formation times are considered.

8 pages revtex, 4 postscript figures