Reactionπ+p→ρ+pat 2.67 GeV/c: A Study of Isoscalar Exchanges

Results are presented of a study of the reaction ${\pi }^{+}p\to {\rho }^{+}p$ at 2.67 GeV/c incident ${\pi }^{+}$ momentum. The contributions due to given spin-parity exchanges are isolated; and, by combining these results with those of a similar ${\pi }^{-}$ experiment, the $I_t=0\mathrm{}$ component of each series is separated. The $\omega$ ($I=0\mathrm{}$, $J^{\mathrm{PG}}=1^{--}$) exchange contribution shows a pronounced dip at $-t=0.4\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. Evidence is presented for the exchange of a state of minimum quantum numbers, $H$ ($I=0\mathrm{}$, $J^{\mathrm{PG}}=1^{+-}$).