Semi-inclusive π0 multiplicity distributions for 2-14 charged prongs are obtained using a generating-function approach based on an expansion in terms of Mueller moments. The four-prong data require the explicit assumption of a two-component model. Under this assumption and the further assumption of no three-neutral-particle correlations, the total pion multiplicity is obtained. The total multiplicity shows peaking at even prongs, indicative of G-parity-conserving diffractive processes which dominate at lower multiplicities. The cross section for these processes is ∼4 mb.
TOTAL NO. EVENTS=21395.
The charged-particle multiplicity distribution from 250-GeV/c π−p interactions in the Fermilab 15-ft bubble chamber is presented. The corrections to the raw data are described. Fits to these data along with other high-energy bubble-chamber data show that cluster models with two components—a low-multiplicity, diffractive component and a high-multiplicity, nondiffractive component—describe the data fairly well. The charged multiplicity of each cluster is found to be ∼2, while the number of clusters for each component grows linearly with ln(s). The multiplicity moments are consistent with other experiments. We find 〈nc〉=8.427±0.059, f2cc=8.66±0.11, 〈nc〉D=2.038±0.023. The total inelastic cross section is σI=21.42±0.50 mb.
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