Differential Cross Section forπ−p→η0nat 6.0 GeV/c

Abstract

We have measured the differential cross section for ${\pi }^{-}p\to {\eta }^{0}n$ at 6.0 GeV/c from 6730 very clean events in which the decay $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ was detected. The high statistics reveals a sizable forward turnover, implying a dominance of the helicity-flip amplitude. A precisely determined $A_2$ trajectory, linear for $\mathrm{}\left|t\right|<1.0\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$, is found from combining our data with those at energies up to 101 GeV.