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

TL;DR

This paper investigates a narrow dip at 1.9 GeV/c^2 in diffractive photoproduction, proposing a mechanism to explain its appearance as a dip and discussing potential interpretations of this phenomenon.

Contribution

It introduces a new explanation for the dip structure in diffractive photoproduction and refits experimental data to support this mechanism.

Findings

The dip at 1.9 GeV/c^2 can be explained by a specific interference mechanism.

Refitted data supports the proposed explanation for the dip.

Discussion of possible physical interpretations of the dip.

Abstract

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 proposed to explain why this resonance appears as a dip, and possible interpretations are discussed.