Production of theJψandψ′(3.7)by 225-GeV/cπ±and Proton Beams on C and Sn Targets

Abstract

We present results of a large-acceptance experiment in which muon pairs were observed in the mass range 0.6 to 6.0 GeV/${\mathit{c}}^2$. Emphasis is given to features of the production of $\frac{J}{\psi }$ and ${\psi }^{\prime }\mathrm{}\left(3.7\right)\mathrm{}$ particles. We find $\frac{{\left[B\sigma \right]}_{{\psi }^{\prime }\mathrm{}\left(3.7\right)\mathrm{}}}{{\left[B\sigma \right]}_{\frac{J}{\psi }}}$ to be 0.007±0.004 for $p$-C and 0.018±0.007 for ${\pi }^{+}$-C interactions. Comparison with results from $e^{+}{e}^{-}$ storage rings indicates that both the $\frac{J}{\psi }$ and the ${\psi }^{\prime }\mathrm{}\left(3.7\right)\mathrm{}$ are produced strongly rather than electromagnetically in our experiment.