Track-Based Alignment of the Inner Detector of ATLAS

Details Track-Based Alignment of the Inner Detector of ATLAS Track-Based Alignment of the Inner Detector of ATLAS

2012-01-24

arxiv.org/abs/1201.4961v1

Physics

Instrumentation and Detectors

Presented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 3 pages, 7 figures

Scientific paper

ATLAS is a multipurpose experiment at the LHC. The tracking system of ATLAS, embedded in a 2 T solenoidal field, is composed of different technologies: silicon planar sensors (pixel and microstrips) and drift-tubes. The procedure used to align the ATLAS tracker and the results of the alignment using data recorded during 2010 and 2011 using LHC proton-proton collision runs at 7 TeV are presented. Validation of the alignment is performed by measuring the alignment observables as well as many other physics observables, notably resonance invariant masses in a wide mass range. The E/p distributions for electrons from Z and W are also extensively used. The results indicate that, after the alignment with real data, the attained precision of the alignment constants is approximately 5 \mu m. The systematic errors due to the alignment that may affect physics results are under study.

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