Charged Particle Multiplicity in Diffractive Deep Inelastic Scattering

TL;DR

This paper analyzes hadron multiplicity in diffractive deep inelastic scattering using perturbative QCD, revealing a preference for a super-hard gluon distribution in the Pomeron to explain experimental data.

Contribution

It provides a theoretical explanation for the excess particle production in diffractive DIS and highlights the sensitivity to the Pomeron's quark-gluon structure.

Findings

Data favors a super-hard gluon distribution in the Pomeron.

Formulas explain the excess of particle production in diffractive DIS.

Results are sensitive to the initial gluon distribution.

Abstract

The recent data from H1 Collaboration on hadron multiplicity in diffractive DIS has been studied in the framework of perturbative QCD as a function of invariant diffractive mass. The formulas obtained explain the observed excess of particle production in diffractive DIS relative to that in DIS and $e^+e^-$ annihilation. It is shown that the results are sensitive to the quark--gluon structure of the Pomeron. Namely, the data say in favour of a super-hard gluon distribution at the initial scale.