Berlin 2005 – wissenschaftliches Programm
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T: Teilchenphysik
T 404: Schwere Quarks IV
T 404.2: Vortrag
Montag, 7. März 2005, 16:50–17:05, TU H2033
Production of the χc Meson in Proton-Nucleus Reactions Measured with the HERA-B Detector — •Aleksandar Aleksandrov — DESY Zeuthen, Platanenallee 6, D-15738 Zeuthen
Charmonium production in hadronic reactions poses interesting challenges to the understanding of QCD. In spite of experimental effort, the mechanisms of quarkonium production in hadronic environment are not well understood. While the primary charmonium production is believed to be perturbatively calculable, formation of the bound states is a nonperturbative QCD process and requires some understanding of the evolution from the quark-antiquark state to the colourless quarkonium states.
HERA-B is a fixed target experiment operating at the HERA storage ring in DESY. Charmonium and other heavy flavor states are produced in inelastic collisions by inserting wire targets into the halo of the 920 GeV proton beam circulating in HERA. A sample of about 160 000 J/ψ→ µ+µ− was collected in the period of 2002/2003 which allows us to study the hadron production of χc. Results on the ratio of χc to J/ψ production will be presented.