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T: Fachverband Teilchenphysik

T 64: Halbleiter 4

T 64.6: Vortrag

Dienstag, 25. März 2014, 18:00–18:15, P109a

Simultaneous alignment in the CMS Silicon Tracker using Millepede II — Nazar Bartosik, •Andrii Gizhko, Gregor Hellwig, Claus Kleinwort, Rainer Mankel, and Matthias Schröeder — Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, Hamburg

The CMS tracker is the world’s largest silicon detector, consisting of more than 25 000 sensors. An accurate determination of their positions and orientations with a precision of the order of 10 µm and 10µrad, respectively, is crucial for the physics performance of the whole experiment. This is achieved by a track-based alignment procedure which makes use of the residuals between the measured and the expected hit-positions of particle trajectories in the detector. Both tracks from pp collisions and cosmic ray muons are taken into account. In this way, approximately 200 000 alignment parameters are determined simultaneously using the Millepede-II programme.

In the presentation, the latest status of the CMS-tracker alignment with the data collected in 2012 is presented, and foreseen improvements for the upcoming data taking at 14 TeV are discussed.