Aug 4 – 8, 2015
America/Detroit timezone

CMS Silicon Tracker Alignment: First Run2 Results

Aug 4, 2015, 2:46 PM
Room D (Michigan League)

Room D

Michigan League

LHC Run-2 Detector Performance LHC Run-2 Detector Performance


Heshy Roskes (Johns Hopkins University (US))


The all-silicon design of the tracking system of the CMS experiment provided excellent resolution for charged tracks and an efficient tagging of jets during Run1 of the LHC. As the CMS tracker, and in particular its pixel detector, underwent repairs and experienced changed conditions with the start of Run2 this year, the position and orientation of each of the 15148 silicon strip and 1440 silicon pixel modules needed to be determined with a precision of several micrometers. The local hit reconstruction required new calibration. We present the first Run2 results of the CMS tracker alignment, calibration, and resolution performance using several million reconstructed tracks from the cosmic data and the first collision data. The achieved resolution in all five track parameters is controlled with data-driven validation of the track parameter measurements near the interaction region, and tested against prediction with detailed detector simulation. Implications for CMS physics performance are discussed.
Oral or Poster Presentation Oral

Primary author

Heshy Roskes (Johns Hopkins University (US))

Presentation materials