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

Abstract

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.

The data of Figure 6 can be obtained by downloading the raw data file e687_6pi.txt. v5 (2nov2018): added Fig. 7, the 6 pion energy distribution as requested by a reader