Dip Structures inπ++p→ρ++pat 1.55-1.84GeVc

Abstract

Results of a high-statistics study of ${\pi }^{+}+p\to {\rho }^{+}+p$ at 1.55-1.84 $\frac{\mathrm{GeV}}{c}$ are consistent with dominance of $\pi$ and $\omega$ exchange close to threshold. A pronounced dip in ${{\rho }_{00}}^s\frac{d\sigma }{\mathrm{dt}}$ at $-t\simeq 0.4$ Ge${\mathrm{V}}^2$ may be attributed to pion exchange with strong absorption.