Analysis of Rapidity Gap Cuts in Diffractive DIS

TL;DR

This paper investigates how rapidity gap cuts in diffractive DIS at HERA influence the accessible phase space and affect the validity of factorization, revealing impacts on process contributions and kinematic regions.

Contribution

It provides an analysis of the effects of rapidity gap selections on the kinematic coverage and factorization properties in diffractive DIS, highlighting their implications for process contributions.

Findings

Rapidity gap cuts restrict phase space for certain kinematics.

Factorization breaks down in large rapidity gap samples.

Quark-antiquark-gluon processes become more prominent.

Abstract

The requirement of a large pseudo-rapidity gap to select diffractive DIS events at HERA restricts the kinematically accessible region of phase space for a significant range of $Q^2$, $\beta$ and $\xpom$. Consequences of this include a breakdown of $\xpom$-factorization in large rapidity gap diffractive samples and an enhancement in the relative contribution of quark-antiquark-gluon processes over dijet processes in the diffractive DIS sample.