Inclusive Δ++ production in pp, K+p, π+p, and π−p interactions at 147 GeV/c

Abstract

We have studied inclusive ${\Delta }^{++}$ production at 147 GeV/c in $\mathrm{pp}$, $K^{+}p$, ${\pi }^{+}p$, and ${\pi }^{-}p$ interactions. All four reactions were detected with the same apparatus and analyzed in the same way. The energy dependence of the ${\Delta }^{++}$ cross section was found to be ${\mathrm{Ap}}^{-1\mathrm{}}+B$ for $\mathrm{pp}$, $K^{+}p$, and ${\pi }^{+}p$ interactions and constant for ${\pi }^{-}p$ interactions. The shape of the inclusive ${\Delta }^{++}$ distributions does not depend on the beam, while the magnitudes are proportional to the total cross sections. We have obtained the effective trajectory at the $p-{\Delta }^{++}$ vertex from a triple-Regge analysis and found that all results are consistent with predictions of a triple-Regge diagram where a Pomeron is exchanged at the beam vertex and a $\pi$ at the target vertex.