Energy dependence of the charged multiplicity in deep inelastic scattering at HERA

TL;DR

This study analyzes charged particle multiplicity in deep inelastic scattering at HERA, examining energy dependence, scaling properties, and comparing results with electron-positron collisions and theoretical models.

Contribution

It provides new measurements of charged multiplicity distributions in DIS at HERA and investigates their energy dependence and scaling behavior using the Breit frame.

Findings

Charged multiplicity increases with energy scale.

KNO-scaling properties are approximately observed.

Data agree with Monte Carlo predictions within uncertainties.

Abstract

The charged multiplicity distributions and the mean charged multiplicity have been investigated in inclusive neutral current deep inelastic $ep$ scattering with the ZEUS detector at HERA, using an integrated luminosity of 38.6 pb$^{-1}$. The measurements were performed in the current region of the Breit frame, as well as in the current fragmentation region of the hadronic centre-of-mass frame. The KNO-scaling properties of the data were investigated and the energy dependence was studied using different energy scales. The data are compared to results obtained in $\epem$ collisions and to previous DIS measurements as well as to leading-logarithm parton-shower Monte Carlo predictions.