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CMS detector resolution

CMS detector resolution. CMS Silicon Strip Tracker CMS Silicon Strip Detector Resolution HIP Silicon Beam Telescope. 0.1. 1.5. 120 cm. 2.5. 20 cm. 2.8 m. 0. CMS Silicon Strip Tracker. Diameter 2.4 m, Length 5.6 m Tracker Inner Barrel (TIB), Tracker Inner Disks (TID),

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CMS detector resolution

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  1. CMS detector resolution • CMS Silicon Strip Tracker • CMS Silicon Strip Detector Resolution • HIP Silicon Beam Telescope

  2. 0.1 1.5 120 cm 2.5 20 cm 2.8 m 0 CMS Silicon Strip Tracker • Diameter 2.4 m, Length 5.6 m • Tracker Inner Barrel (TIB), Tracker Inner Disks (TID), Tracker Outer Barrel (TOB), Tracker End Caps (TEC) • Temperature -10 C

  3. CMS Silicon Strip Detectors • n-type <100> FZ Silicon wafers, p+ strips, AC coupled, single-sided • Strip width: strip/pitch ~ 0.25, strip length typically 12.5 cm

  4. Needs for Detector Resolution • Objective of CMS and Tracker: to detect signatures of new physics at LHC • Method: by identifying and precisely measuring leptons, photons and jets • Tools: Tracking and Vertex reconstruction within a strong 4 T magnetic field • Tracker measurements are combined with track segments reconstructed in the outer muon system -> to further extend the region over which a precise MUON momentum measurement can be performed (-> alignment)

  5. Requirements for the Detector Resolution • CMS Tracker is designed to ensure high quality momentum resolution: • momentum resolution better than pT/pT = 0.15*pT (in TeV/c), all   2.5 • Hit resolution requirements for successful track reconstruction: • around 15 um @ Tracker inner radius • around 40 um @ Tracker outer radius • This means: • Pixel: barrel 10 –15 um endcaps 15 –20 um • TIB: better than 20 um for shorter pitches approaching (pitch/neliojuuri12) for larger pitches • TOB: pitch 140 um -> resolution better than 40 um pitch 210 um -> resolution better than 60 um (for hight pT tracks)

  6. Studies of Single Track Performance • Study of single hit quality for several pitch values • Study of single muon tracks of several pT values in all silicon tracker • -> evaluation of the precision of the track reconstruction performance • Accumulation of 500 tracks for statistics • CMSIM & GEANT

  7. Test beam results of the Detector Resolution • Barrel strip detector: 50 um pitch, 12.5 cm length -> hit resolution 11 um • Double-sided detectors: pitch 100 um, stereo angle 100 mrad -> resolution 34 um orthogonal to stereo strips and 320 um in the stereo coordinate • Wedge detector: 6.25 cm strips, 38-50 um pitch -> resolution 7 um • The dependence of the resolution on the signal-to-noise-ratio, bias voltage and incidence angle is weak

  8. HIP Silicon Beam Telescope • Our ”mini-Tracker” • 8 layers of Silicon detectors & adequate read-out electronics and DAQ • Pitch 55 um • Spatial resolution obtained in summer 2001 beam tests: 10 m • Summer 2002: our own rad-hard Cz detectors & stereo angle detector

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