Does the detector at CERN detect signals across two or three dimensions? Why?

Question: Does the detector at CERN detect signals across two or three dimensions? Why?
- Keywords:
  CERN,
  dimensions,
  particle physics
Asked by strangeness to Arttu, Ceri, James_M, Monica, Philip on 20 Jun 2011.
- James M Monk answered on 20 Jun 2011:
  
  The LHC detectors all have some ability to track particles in 3D. For example, my experiment (ATLAS) has an inner detector that is made of pixels and strips of silicon. when a charged particle passes through these pixels/strips it creates a free electon/hole pair in the silicon, which causes an electronic signal that is amplified and detected. So we end up with a “track” of silicon hits left by the passing particle that reveal its trajectory in three dimensions.

strangeness commented on 24 Jun 2011:

Thank you! Wouldn’t this method of detection alter the charged particle’s velocity though?

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Question: Does the detector at CERN detect signals across two or three dimensions? Why?