Straight line track reconstruction for the ATLAS IBL testbeam with the EUDET telescope.

Track reconstruction based on the Kalman filter has been implemented for straight line tracks in data taken with the EUDET beam telescope. The information filter formulation of the Kalman filter has been used to implement the combinatorial Kalman filter and the Deterministic Annealing Filter to deal with noisy input data. In addition to the Kalman filter based track finding, a new and simple to develop and implement track finding method based on cluster finding has been studied. The methods have been tested and compared using a simple simulation. The simulation studies show that both the combinatorial Kalman filter and the cluster track finder have high track finding efficiency, and that the Deterministic Annealing Filter is able to reduce the noise contamination and improve the precision of the track estimates. Real test beam data has been reconstructed with excellent goodness of fit.