A quark-gluon plasma search in anti p--p at √s = 1.8 TeV

The search by E-735 for QGP evidence in centrally produced particles in bar pp collisions has revealed several interesting results in the behavior with variation of dNc/dη in the measured interval from 2--18. In left-angle Pt right-angle we see a decrease in slope for all particles near dNc/dη ≅ 9 corresponding to a Bjorken initial energy density of 2.2 GeV/fm3. Above dNc/dη = 10, the increase of left-angle Pt right-angle is small except for bar p's where the data suggest a 25% increase in the region 13--18. In the particle ratios, normalizing to π's, they (K, bar p, Λ0, γ) are all independent of dNc/dη within errors of ± 15% except for K±/π± which increases by 30% in the interval 7 to 18. Based on the E-735 data analyzed to data, one can conclude that QGP is not manifest in bar pp collisions at 1.8 TeV. Nonetheless, there are the two effects mentioned above, which can be explored with much improved sensitivity using the high-statistics data of the '88--'89 run