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HK: Fachverband Hadronen und Kerne

HK 68: Heavy Ion Collisions and QCD phases

HK 68.3: Talk

Thursday, March 19, 2009, 17:15–17:30, H-ZO 10

Open charm measurement in the CBM experiment — •Vassiliev Iouri — Kirchhoff-Institut für Physik, Heidelberg, Germany

One of the major experimental challenges of the CBM experiment is to trigger on the displaced vertex of the Open charm particle decays via hadronic decay modes in the environment of a heavy-ion collision. This task requires fast and efficient track reconstruction algorithms and high resolution secondary vertex determination. Particular difficulties in recognizing the displaced vertex of the rare D-meson and Λ_c decays are caused by weak K_S⁰ and Λ decays which produce displaced vertices 1 cm downstream the target, very low multiplicity of the D-meson production, low branching ratios and multiple scattering in the beam pipe and detectors.

The primary and secondary vertices have been reconstructed with high accuracy (5 µm and 50 µm respectively) from the tracks fitted in the STS with a non-homogeneous magnetic field by the Kalman filter procedure.

Two open charm trigger configurations have been proposed: Detached Kaon Trigger and Detached Vertex Trigger.

Progress with feasibility studies of the open charm measurements in the CBM experiment will be discussed.

* Supported by EU-FP6 HadronPhysics