The basic design criteria of the detector included the following points: * Excellent electromagnetic calorimetry for electron and photon identification and measurements, complemented by full-coverage hadronic calorimetry for accurate jet and ETmiss measurements; * High-precision muon momentum measurements, with the capability of accurate measurements at the highest collision rates using the external muon spectrometer alone; * Efficient charged particle tracking at high luminosity for high transverse momentum (pT) lepton-momentum measurements, electron and photon identification, τ-lepton and heavy-flavour identification, and full event reconstruction capability at lower luminosity; * Large acceptance in pseudorapidity (η) with almost full azimuthal angle (φ) coverage everywhere. The azimuthal angle is measured around the beam axis z, whereas pseudorapidity relates to the polar angle (θ) where θ is the angle from the z direction, $\eta = - \ln \left(\tan \frac{\theta}{2} \right)$. * Triggering and measurements of particles at low-pT thresholds, providing high efficiencies for most physics processes of interest at the LHC.

-- ChrisSeez - 2014-11-11

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Topic revision: r1 - 2014-11-11 - ChrisSeez
 
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