Speaker
Zijin Guo
(Johns Hopkins University-Unknown-Unknown)
Description
We present the first results of the full CMS Silicon Tracker alignment based
on several million reconstructed tracks from the cosmic data taken during
the commissioning runs with the detector in its final position. Implication
for CMS physics performance is discussed. The all-silicon design of the
tracking system of the CMS experiment is expected to provide 1-2% resolution
for 100 GeV tracks and an efficient tagging of b-jets. To achieve optimal
performance the position and orientation of each of the 15148 silicon strip
and 1440 silicon pixel modules need to be determined with a precision of
several micrometers. For the modules well illuminated by cosmic ray
particles, the ultimate precision has been achieved with data from the
silicon modules traversed in-situ by charged muons used in combination with
survey measurements. 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. Outlook for expected tracking and physics performance
with the first collisions is given.
Author
Boaz Klima
(Fermi National Accelerator Lab. (Fermilab)-Unknown-Unknown)
