Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 55: Heavy Ion Collisions and QCD phases

HK 55.8: Vortrag

Mittwoch, 18. März 2009, 18:45–19:00, H-ZO 10

reconstruction of D^*+ → D⁰ + π⁺ in p+p collisions at √s = 10 TeV in the central barrel of ALICE — •yifei wang — Physikalisches Institut, Heidelberg, Germany

Heavy quarks(c, b), due to their large mass, are excellent tools to study the degree of thermalization of the initially created matter in high energy nuclear collisions at LHC. Their masses remain heavy, even if chiral symmetry is restored in a QGP. Furthermore, theoretical predictions of heavy-quark production have large uncertainties due to the poorly known parton distributions in the low Feynman-x region relevant for LHC energies. Thus, measurements on charm production in p+p and Pb+Pb collisions at LHC energy are essential.

We present the latest results of our performance studies on open-charm resonance production measurements in p+p collisions at √s = 10 TeV with the ALICE central barrel based on the measurement of D^*+ mesons. The decay channel D^*+ → D⁰ + π⁺ (BR: 68%), where the D⁰ mesons are reconstructed in the D⁰ → K⁻ + π⁺ decay channel (BR: 4%), is investigated using events generated by PYTHIA and a full Monte Carlo simulation of the ALICE setup with all sub-detectors in the central barrel. The influence of single-track selection and topological cuts on the signal to background ratio are presented.