Evidence for a narrow dip structure at 1.9 GeV/c${}^2$ in $3{\pi }^{+}3{\pi }^{-}$ diffractive photoproduction

E687 Collaboration, P. L. Frabetti

A narrow dip structure has been observed at 1.9 GeV/c${}^2$ in a study of diffractive photoproduction of the $3{\pi }^{+}3{\pi }^{-}$ final state performed by the Fermilab experiment E687.