Reactionp+p→γ+Anything at 205 GeV and Its Implications forπ0Production

Abstract

From observations of photon conversions into electron pairs in the 30-in. hydrogen bubble chamber exposed to a 205-GeV proton beam at the National Accelerator Laboratory, we have measured topological and differential cross sections for the inclusive reaction $p+p\to {\gamma }^{+}$ anything. Comparison with data on the same reaction at the CERN intersecting storage rings suggests that ${\pi }^0$ production in $\mathrm{pp}$ collisions has reached a scaling limit by 205 GeV. We find that for multiplicities up to about 12, the average number of ${\pi }^0$'s per inelastic $\mathrm{pp}$ collision increases with the number of charged particles produced.