determined from Figure 7. The result is shown in Figure 8 for central Au + Au collisions. At beam energies of $11.6$ GeV/A we produce $0.33$ additional negatively charged pions per participating baryon. This is an upper limit, and in reality we would expect less.

These additional mesons might be visible in the charged particle multiplicity distribution which would have the form $$\begin{aligned}
P_n = (1-q) \, P_{\; n}^{\rm had} (N_{\rm had})
    + q \, P^{\rm qg}_{\; n} (N_{\rm qg})\, .
\label{double}\end{aligned}$$ Here $q$ is the probability of finding a central event in which plasma is formed, $P_{\; n}^{\rm had}$ is the multiplicity distribution for purely hadronic events with mean $N_{\rm had}$, and $P^{\rm qg}_{\; n}$ is the multiplicity distribution for events in which a plasma was formed with mean $N_{\rm qg}$.

Experimentally one would expect to see a bump in $P_n$ at larger values of $n$. A structure like that was found in charged particle multiplicity distributions in $p\bar{p}$ collisions at the CERN [@ua5; @fuglesang] and Fermilab [@cdf; @e735] colliders. For energies larger then 540 GeV a shoulder develops in the multiplicity distribution, becoming more pronounced as the beam energy increases. It is assumed that this structure is due 