Event Reconstruction in the CBM Experiment

The efficiency of track reconstruction for particles detected in at least four stations is presented in Table 1. Two STS detector setups have been investigated. In the idealistic setup all stations are pixel-like detectors. The realistic setup consists of (going downstream) 2 MAPS detectors, 1 pixel detector and 4 double-sided silicon strip detectors with 15 stereo angle. Different number of pile-up events in the MAPS stations have been investigated. Track fitting [1, 2] is done using the Kalman filter technique. A special analytic formula [3] has been derived for fast track extrapolation in a non-homogeneous magnetic field. The precision of extrapolation does not depend on the shape of the magnetic field. The extrapolated track parameters are expanded in a power series of the magnetic field components. The formula with terms up to the third order has the quality of propagation equal to the fourth-order Runge-Kutta method.