Anti-Lambda/Anti-Proton ratios at the AGS

Abstract

We attempt to explain the large $\bar{\hat{I}}›/\bar{p}$ ratios measured in heavy ion collisions at $12\mathrm{A}\cdot \mathrm{GeV}/c$ beam momentum within an hadronic framework. The ratios are large compared to corresponding ratios in $pp$ collisions, and to thermal fits. We show using a simple model and a detailed cascade calculation 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. Uncertainties in elementary cross--sections and formation times are also considered.

8 pages revtex, 4 postscript figures