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

Details ${\barΛ}/{\bar p}$ ratios in heavy ion collisions at 11.6 AGeV/c ${\barΛ}/{\bar p}$ ratios in heavy ion collisions at 11.6 AGeV/c

1998-07-10

arxiv.org/abs/nucl-th/9807036v1

Physics

Nuclear Physics

Nuclear Theory

8 pages revtex, 4 postscript figures

Scientific paper

We attempt to explain the ${\bar \Lambda}/\bar p$ ratios measured in heavy ion collisions at $11.6~{\rm A\cdot GeV}/c$ 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 $\bar \Lambda$'s and $\bar p$'s, and the net conversion of $\bar p$'s to $\bar \Lambda$'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.

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