Production of D* Mesons with Dijets in Deep-Inelastic Scattering at HERA

TL;DR

This paper measures D* meson production with dijets in deep-inelastic scattering at HERA, comparing results with NLO QCD and CCFM models, and finds good agreement within uncertainties.

Contribution

It provides detailed measurements of D* and dijet production in DIS and compares them with advanced QCD models, confirming their validity without additional photon components.

Findings

Measured cross sections agree with NLO QCD predictions

Data are well described by CCFM-based models

No need for additional resolved photon component

Abstract

Inclusive D* production is measured in deep-inelastic ep scattering at HERA with the H1 detector. In addition, the production of dijets in events with a D* meson is investigated. The analysis covers values of photon virtuality 2< Q^2 <=100 GeV^2 and of inelasticity 0.05<= y <= 0.7. Differential cross sections are measured as a function of Q^2 and x and of various D* meson and jet observables. Within the experimental and theoretical uncertainties all measured cross sections are found to be adequately described by next-to-leading order (NLO) QCD calculations, based on the photon-gluon fusion process and DGLAP evolution, without the need for an additional resolved component of the photon beyond what is included at NLO. A reasonable description of the data is also achieved by a prediction based on the CCFM evolution of partons involving the k_T-unintegrated gluon distribution of the proton.