Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 15: Flavourphysik (Theorie) II
T 15.1: Vortrag
Freitag, 1. April 2011, 14:00–14:15, 30.23: 3-1
How much charm can PANDA create? — •Christoph Klein, Alexander Khodjamirian, Thomas Mannel, and Yu-Ming Wang — Theoretische Physik 1, Universität Siegen
At the future PANDA experiment at the FAIR facility in Darmstadt, proton-antiproton collisions will be studied at an energy up to ≃ 5.5 GeV, which suffices to produce charmed hadron pairs like DD or ΛcΛc. Their yet unknown production cross sections are of special interest: If they are high enough, they could provide higher statistics for the investigation of CP violation and rare decays of charmed hadrons.
It is a difficult task to predict these cross sections, since the energy here is still slightly above the production threshold and so not easily accesable to perturbative QCD. We describe the process by a model based on the exchange of intermediating hadrons according to Regge theory, which is known to give accurate predictions for hadronic processes in this kinematical region.
An important ingredient are process-dependent coupling constants between the hadrons, which we calculate using the method of QCD light-cone sum rules. As a byproduct we also obtain semileptonic decay widths for heavy baryons, like e.g. Λb→ pℓνℓ. Making use of the Regge model we give an improved estimate of the cross sections for exclusive open charm production at PANDA energies.