Evolution of ep Fragmentation and Multiplicity Distributions in the Breit Frame

TL;DR

This paper analyzes how fragmentation and multiplicity distributions in deep-inelastic ep scattering evolve with energy in the Breit frame, comparing results with e+e- data and theoretical predictions to understand particle production mechanisms.

Contribution

It presents the evolution of fragmentation functions and multiplicity distributions in ep scattering, comparing with e+e- results and testing MLLA predictions.

Findings

Differences observed between ep and e+e- multiplicities at low energies.

Fragmentation peak and width evolve with Q as predicted.

KNO scaling behavior discussed in the context of ep data.

Abstract

Low x deep-inelastic ep scattering data, taken in 1994 at the H1 detector at HERA, are analysed in the Breit frame of reference. The evolution of the peak and width of the current hemisphere fragmentation function is presented as a function of Q and compared with e+e- results at equivalent centre of mass energies. Differences between the average charged multiplicity and the multiplicity of e+e- annihilations at low energies are analysed. Invariant energy spectra are compared with MLLA predictions. Distributions of multiplicity are presented as functions of Bjorken-x and Q^2, and KNO scaling is discussed.