Physics – Medical Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apsp.conf..386y&link_type=abstract
ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 10th Conference. Held
Physics
Medical Physics
Cms, Ecal, Calibration
Scientific paper
Inter-calibrating the electromagnetic calorimeter (ECAL) of the CMS detector in situ at the LHC to achieve the energy resolution approaching 0.5% at high energy is going to be important to fully exploit the physics reach of the detector, particularly for the discovery of the Higgs boson in the two-photon decay channel. In this paper we evaluate the potential of a calibration technique that makes use of photon pairs produced in neutral pion decays, π0 → γγ. Such photon pairs will be selected from the QCD events accepted by the Level-1 triggers using an online filter farm. Assuming a Level-1 trigger rate of 12.5 kHz, the rate of suitable neutral pions is found to be about 0.9 kHz.
We show that 95% of the barrel electromagnetic calorimeter can be calibrated to at least 1% (0.5%) precision after several days (weeks) of data-taking in the low-luminosity scenario of LHC, {L} = 2 \cdot 1033 cm-2s-1. In addition, we show that a 1% calibration precision is achieved with π0 decays produced in the π- test beam runs during November 2006. The obtained calibration constants are successfully used for the reconstruction of 50 GeV electrons from the test beam data.
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