Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 28: QCD 3
T 28.2: Vortrag
Dienstag, 5. März 2013, 17:00–17:15, GER-037
Measurement of charm fragmentation fractions in photoproduction at HERA — •Ganna Dolinska1, Ievgen Korol1, Olaf Behnke1, and Erich Lohrmann2 — 1DESY, Hamburg, DE — 2University Hamburg, DE
The production of the D0, D*+, D+, Ds+ and Λc+ charm hadrons in ep scattering at HERA was studied with the ZEUS detector, and the fractions of c quarks hadronising as a particular charm hadron were derived. In addition, the ratio of neutral to charged D meson production rates, the fraction of charged D-mesons produced in a vector state, and the stangeness-suppression factor have been determined. The measurement has been performed in the photoproduction regime, using the full HERA II data set with a total integrated luminosity of 372 pb−1. The charm hadrons were reconstructed in the range of transverse momentum pT(D,Λc)>3.8 GeV and pseudorapidity |η(D,Λc)|<1.6. The charm fragmentation fractions are compared to previous results from HERA and from e+e− experiments. The data support the hypothesis that fragmentation proceeds independently of the hard production.