The CMS experiment at the CERN LHC

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Abstract

The Compact Muon Solenoid (CMS) detector is described.The detector operates at the Large Hadron Collider (LHC) at CERN.It was conceived to study proton-proton (and leadlead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 10 34 cm -2 s -1 (10 27 cm -2 s -1 ).At the core of the CMS detector sits a high-magneticfield and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling hadron calorimeter.The iron yoke of the flux-return is instrumented with four stations of muon detectors covering most of the 4π solid angle.Forward sampling calorimeters extend the pseudorapidity coverage to high values (|η| ≤ 5) assuring very good hermeticity.The overall dimensions of the CMS detector are a length of 21.6 m, a diameter of 14.6 m and a total weight of 12500 t.