Performance of the CMS tracking detectors from the 2009 LHC run

TL;DR

This paper evaluates the performance of CMS silicon tracking detectors during the 2009 LHC run, analyzing signal quality, efficiency, and simulation accuracy to assess detector capabilities in early proton-proton collisions.

Contribution

It provides the first detailed performance assessment of CMS silicon trackers using 2009 LHC collision data, including efficiency and reconstruction quality comparisons.

Findings

High signal-to-noise ratios achieved

Track reconstruction efficiencies are consistent with simulations

Successful resonance reconstruction demonstrates detector effectiveness

Abstract

The 2009 run provided the first proton-proton collisions from the Large Hadron Collider (LHC) at center of mass energies of 900 GeV and 2.36 TeV. The Compact Muon Solenoid (CMS) experiment has recorded a large sample of minimum bias events from these collisions. We present results from the all silicon tracking detectors from this run. The performance of the tracker and track reconstruction algorithms are considered including signal-to-noise, efficiencies and comparisons to simulation for track parameter and resonance reconstruction performance.