Jets and fragmentation

TL;DR

This paper reviews advanced NLO calculations for hadronic final states in deep-inelastic scattering, focusing on (2+1)-jet cross sections, the transition to photoproduction, and the applicability of fragmentation functions at low Q^2 and x_p.

Contribution

It provides an overview of recent progress in NLO calculations and examines the fragmentation function model in specific kinematic regions.

Findings

Improved NLO calculations for (2+1)-jet cross sections.

Insights into the transition between DIS and photoproduction.

Assessment of fragmentation function validity at small Q^2 and x_p.

Abstract

I review the status of next-to-leading-order calculations for hadronic final states in deeply-inelastic lepton--nucleon scattering. In more detail, I focus on calculations of (2+1)-jet-type cross sections, describe recent progress in extending the perturbative description into the transition region between deeply inelastic scattering and photoproduction, and study the validity of the fragmentation function picture for one-particle-inclusive cross sections at small Q^2 and small x_p.