Feasibility of intercalibration of CMS ECAL supermodules with cosmic rays
Paul Scherrer Institute, 5232, Villigen, Switzerland
2 Department of Physics, University of Virginia, 22904-4714, Charlottesville, VA, USA
The feasibility of using cosmic rays to make an intercalibration of the ECAL Supermodules before installation in CMS has been investigated. In a test with a single crystal a clear signal with a width of 15% rms was seen, with rates as expected. Simulations using a simplified detector geometry and a parameterisation of the vertical cosmic ray muon flux indicate that it is feasible to use the surrounding crystals as veto counters to ensure a longitudinal trajectory through the crystal, without introducing a large systematic error. The statistical error would be around 1% for one week of running.
© Springer-Verlag, 2005