Regge-Eikonal Approach and its off-Shell Extention Versus Experimental Data

TL;DR

This paper extends the Regge-eikonal approach to off-shell conditions, effectively describing HERA vector-meson production data without introducing additional hard trajectories.

Contribution

It introduces an off-shell extension of the Regge-eikonal model that incorporates off-shell unitarity and explains experimental data without extra hard trajectories.

Findings

Successfully describes HERA vector-meson production data

No need for additional high-intercept trajectories

Maintains classical universal Regge trajectories

Abstract

We develop an off-shell extention of the Regge-eikonal approach which automatically takes into account off-shell unitarity. We argue that exclusive vector-meson production cross-sections measured at HERA can be fairly described with classical universal Regge trajectories. No extra ``hard'' trajectories of high intercept are needed for that.