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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Physik mit schweren Ionen

HK 13.2: Talk

Monday, March 10, 2008, 17:00–17:15, 2E

Open charm measurements in the CBM experiment — •Selim Seddiki^1,2, Christina Dritsa², Michael Deveaux³, and Iouri Vassiliev¹ for the CBM collaboration — ¹GSI, Darmstadt, Germany — ²IPHC, Strasbourg, France — ³Goethe University, Frankfurt, Germany

The CBM experiment at the FAIR-SIS300 will study the properties of nuclear matter at extreme densities by colliding heavy ions at beam energies from 8 to 45 AGeV. One of the key observables for CBM is the production of open charm, considered as a probe which is sensitive to the early, high-density stage of the collision. The challenge of this measurement lies in the extremely low multiplicity, open charm being close to its production threshold at FAIR energies, within an environment of several hundreds of prompt charged particles. The displaced vertex topology of the open charm decay into charged hadrons has to be exploited in order to suppress the background of primary particles sufficiently. This task requires an excellent vertexing performance to be provided from the CBM micro-vertex detector (MVD). We will present feasibility studies for open charm measurements in CBM based on semi-realistic detector response simulation and full event reconstruction. Our results show that the measurements of the main reaction channels (D⁰, D^±, D^*, D_s) appears feasible provided the targeted detector performances can be reached.

Supported by EU-FP6 Hadron Physics