Mainz 2004 – wissenschaftliches Programm

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T: Teilchenphysik

T 503: Schwere Quarks IV

T 503.3: Vortrag

Mittwoch, 31. März 2004, 16:55–17:10, HS I

Production of Charmonium States in Proton-Nucleus Reactions Measured with the HERA-B Detector — •Aleksandrov Aleksandar — DESY Zeuthen, Platanenallee 6, 15738 Zeuthen

Charmonium production in hadronic reactions poses interesting challenges to the understanding of QCD. In spite of experimental efforts, the mechanisms of quarkonium production in hadronic environments 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. Since a signature of Quark-Gluon-Plasma is the suppression of charmonium production it is very important to understand the “normal” nuclear suppression of charmonium in proton-nucleus collisions.

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 300000 J/ψ’s was collected in the period of 2002/2003 which allows us to study the hadron production of charmonium.