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T: Fachverband Teilchenphysik

T 75: Experimentelle Methoden 2

T 75.1: Talk

Tuesday, February 28, 2012, 16:45–17:00, VG 0.111

Inner Detector tracking performance with high pile-up in ATLAS — •Christoph Wasicki — DESY, Zeuthen

ATLAS is a multi purpose detector predominantly designed for the reconstruction of pp-collisions at the Large Hadron Collider. An important ingredient for the event reconstruction is the tracking of charged particles. In ATLAS this is achieved deploying two different silicon detectors and a transition radiation tracker. The spatial information returned by the sensitive detector elements when traversed by charged particles are clustered to discrete space points. Dedicated tracking algorithms reconstruct the original track of the charged particle. This becomes more difficult with higher numbers of particles, i.e. a higher number of space points.

With the increase of the instantaneous luminosity in 2012 there will be up to 40 pile-up collisions per bunch crossing. Hence ATLAS standard tracking is not feasible anymore with respect to the rate of wrongly reconstructed tracks and reconstruction time. New tracking cuts have been studied to speed up track reconstruction and reduce the fake rate while keeping reconstruction efficiency stable.