some extent but in the end some summations remain which must be done numerically.

The number of nucleon-nucleon collisions as a function of $s$ are plotted in Figure 4. Both $w$ = 0.5 and 0.8 are shown; there is little difference. The laboratory beam energy is 11.6 GeV per nucleon and the nuclei are gold. The spike represents the delta function from primary-primary collisions. The contribution from primary-secondary collisions falls from about 11 to 7 GeV$^{-2}$ as $s$ goes from 9 to 25 GeV. The contribution from secondary-secondary collisions is almost negligible.

The pion multiplicity distribution arising from these hard collisions is shown in Figure 5. It drops by more than nine orders of magnitude in going from 6 pion production to 18 pion production. Typically there is only one hard nucleon-nucleon collision leading to the production of seven pions in a central gold-gold collision at this energy.

We are interested in the possibility that one of these star bursts nucleates quark-gluon plasma. The precise criterion for this to happen is not known. However, we can make some reasonable estimates. In [@us] we estimated that a critical size plasma droplet at these temperatures and baryon densities would have a mass 