On the narrow dip structure at 1.9 GeV/c${}^2$ in diffractive photoproduction

P. L. Frabetti

The narrow dip observed at 1.9 GeV/c${}^2$ by the Fermilab experiment E687 in diffractive photoproduction of $3{\pi }^{+}3{\pi }^{-}$ is examined. The E687 data are refitted, a mechanism is propo…