CMS detector resolution z CMS Silicon Strip Tracker

CMS detector resolution z CMS Silicon Strip Tracker z CMS Silicon Strip Detector Resolution z HIP Silicon Beam Telescope ET 01. 06. 2002

CMS Silicon Strip Tracker z Diameter 2. 4 m, Length 5. 6 m z Tracker Inner Barrel (TIB), Tracker Inner Disks (TID), Tracker Outer Barrel (TOB), Tracker End Caps (TEC) z Temperature -10 C 0. 1 1. 5 120 cm 2. 5 20 cm 0 ET 01. 06. 2002 2. 8 m

CMS Silicon Strip Detectors z n-type <100> FZ Silicon wafers, p+ strips, AC coupled, single-sided z Strip width: strip/pitch ~ 0. 25, strip length typically 12. 5 cm Wafer thickness m Resistivity k cm Pitch @ barrel detectors m Pitch @ disk detectors m Inner Tracker 320 1. 5– 3. 0 80 or 120 81 -112 … 124 -158 Outer Tracker 500 3. 5– 6. 0 122 or 183 126 -143 … 186 -205 ET 01. 06. 2002

Needs for Detector Resolution z Objective of CMS and Tracker: to detect signatures of new physics at LHC z Method: by identifying and precisely measuring leptons, photons and jets z Tools: Tracking and Vertex reconstruction within a strong 4 T magnetic field z 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) ET 01. 06. 2002

Requirements for the Detector Resolution z CMS Tracker is designed to ensure high quality momentum resolution: y momentum resolution better than p. T/p. T = 0. 15*p. T (in Te. V/c), all 2. 5 z Hit resolution requirements for successful track reconstruction: x around 15 um @ Tracker inner radius x around 40 um @ Tracker outer radius z This means: x Pixel: barrel 10 – 15 um endcaps 15 – 20 um x TIB: better than 20 um for shorter pitches approaching (pitch/neliojuuri 12) for larger pitches x TOB: pitch 140 um -> resolution better than 40 um pitch 210 um -> resolution better than 60 um (for hight p. T tracks) ET 01. 06. 2002

Studies of Single Track Performance z z z Study of single hit quality for several pitch values Study of single muon tracks of several p. T values in all silicon tracker -> evaluation of the precision of the track reconstruction performance Accumulation of 500 tracks for statistics CMSIM & GEANT ET 01. 06. 2002

Test beam results of the Detector Resolution z Barrel strip detector: 50 um pitch, 12. 5 cm length -> hit resolution 11 um z Double-sided detectors: pitch 100 um, stereo angle 100 mrad -> resolution 34 um orthogonal to stereo strips and 320 um in the stereo coordinate z Wedge detector: 6. 25 cm strips, 38 -50 um pitch -> resolution 7 um z The dependence of the resolution on the signal-to-noise-ratio, bias voltage and incidence angle is weak ET 01. 06. 2002

HIP Silicon Beam Telescope z z z 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 ET 01. 06. 2002