D* (+jets) in Deep Inelastic Scattering and Photoproduction

TL;DR

This paper presents new measurements of charm quark production at HERA, comparing experimental results with QCD calculations and combining different methods to determine the charm contribution to proton structure.

Contribution

It provides expanded phase space measurements and compares multiple theoretical models, enhancing understanding of charm production in deep-inelastic scattering and photoproduction.

Findings

Agreement with NLO QCD calculations in certain regimes

Charm contribution to proton structure determined with multiple techniques

Enhanced phase space coverage for charm production measurements

Abstract

New results on charm quark production at HERA in an increased phase space in deep-inelastic scattering and photoproduction are discussed. Single & double-differential cross section distributions are compared to next-to-leading order QCD calculations as well as to MC@NLO in the photoproduction regime. The charm contribution to the proton structure, F_2^cc(x,Q^2), is determined with different experimental techniques and finally combined.