Abstract
The Pixel Detectors of the Compact Muon Solenoid (CMS) experiment were installed and commissioned in the Summer and Fall of 2008, removed, repaired and reinstalled in the Spring of 2009 and recommissioned in the Summer of 2009 in preparation for beam at the Large Hadron Collider (LHC). In this note we present pixel detector operating parameters, vertexing performance, and long-lived particle mass reconstruction using data collected during the Fall of 2009 with 450 GeV/ c and 1.18 TeV/ c circulating proton beams.
Highlights
The Compact Muon Solenoid (CMS) pixel detector consists of a central barrel (Fig. 1)and pairs of forward disks (Fig. 2)
The CMS pixel detector consists of a central barrel (Fig. 1)
To enhance the spatial resolution by analog signal interpolation, the effect of charge sharing induced by the large Lorentz drift in the 4 T (z) magnetic field is used in the barrel
Summary
The two pairs of forward disks (FPIX) are placed 34.5 cm and 46.5 cm from the barrel center. To achieve optimal vertex position resolution in both the (rφ) and the z coordinates an almost square pixel shape was adopted. To enhance the spatial resolution by analog signal interpolation, the effect of charge sharing induced by the large Lorentz drift in the 4 T (z) magnetic field is used in the barrel. The charge sharing is working in the FPIX using the turbine shapes of the blades. More details of the CMS detector layout and geometry can be found in reference [1]. In the fall of 2009, collisions in the CMS detector at CERN provided the data necessary to produce detailed studies of the performance of the pixel detectors. 10 μb−1 note we proton–proton√colliat 900 GeV s and will mention preparations for proton-proton running, the current status of the pixel detectors, and some physics benchmarks determined using information from the pixel detectors
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