Inelastic Reactions in Proton-Deuteron Scattering at 1.825 and 2.11 GeV/c

Abstract

The final states $p_s\mathrm{pp}{\pi }^{-}$, $p_s\mathrm{pp}{\pi }^{-}{\pi }^0$, $p_s\mathrm{pn}{\pi }^{+}{\pi }^{-}$, and $p_s\mathrm{pp}{\pi }^{+}{\pi }^{-}$ have been observed in $\mathrm{pd}$ collisions at 1.825 and 2.11 GeV/c. The spectator-nucleon momentum and angular distributions are shown to require the addition of double-scattering events to the usual impulse-model predictions, in proportions varying between 15 and 40%. Results for the reaction $\mathrm{pn}\to \mathrm{pp}{\pi }^{-}$ are in good agreement with the one-pion-exchange model. The cross section for the $T=0\mathrm{}$ part of the reaction $\mathrm{pn}\to \mathrm{pn}{\pi }^{+}{\pi }^{-}$ rises by 0.92±0.22 mb between 1.825 and 2.11 GeV/c, compared with a rise of 3 mb in the total $T=0\mathrm{}$ nucleon-nucleon cross section in the same energy region; but no evidence has been found for the reaction $\mathrm{pn}\to N{N}^{*}\mathrm{}\left(1470\right)\mathrm{}$.