Line-Reversal Comparison of $\overline{p}p\to {\pi }^{+}{\pi }^{-}$ and ${\pi }^{-}p\to p{\pi }^{-}$ at 6 GeV/c

We present differential cross sections at 6 GeV/c for the baryon-exchange reactions (1) $\overline{p}p\to {\pi }^{+}{\pi }^{-}$ and (2) ${\pi }^{-}p\to p{\pi }^{-}$ over the range $-t_{min}<-t<\mathrm{}1.5\mathrm{}$ Ge${\mathrm{V}}^2$. Unlike previous experiments at similar momenta, our results are consistent with line-reversal symmetry for $-t<\mathrm{}1.0\mathrm{}$ Ge${\mathrm{V}}^2$. We contrast this to our previous results on (3) $\overline{p}p\to {\pi }^{-}{\pi }^{+}$ and (4) ${\pi }^{+}p\to p{\pi }^{+}$ for which line-reversal symmetry is not satisfied.