Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 26: QCD 2

T 26.2: Group Report

Tuesday, February 28, 2012, 17:05–17:25, ZHG 009

Measurements of D^* production in DIS with the ZEUS detector — •Olena Bachynska — DESY (Deutsches Elektronenen-Synchrotron)/ Hamburg Universität, Hamburg, Notkestrasse 85

Charm production at the HERA collider was studied using the ZEUS detector. Measurements were performed in the deep inelastic scattering regime, where the incoming lepton scatters on the proton with a large angle and can be seen in the detector. Charm production in DIS is dominated by the boson-gluon fusion process. It was studied via D^*+→ K⁺,π⁻,π_s⁺ meson decay and it’s charge conjugate. The DIS events were reconstructed in the the region of 5 <Q²< 1000 GeV², 0.02<y<0.7, where Q² is the virtuality of the exchanged photon and y is the inelasticity. D^* mesons were required to have |η(D^*)|<1.5 and 1.5<p_T(D^*)<20 GeV/c. Single differential and double-differential cross sections were measured and compared to NLO predictions and to the results from the H1 collaboration. The charm contribution to the proton structure function, F₂^cc, was extracted and compared to the ZEUS D⁺  measurements and to the HERA combined results.