High energy cosmic muons and the calibration of the L3 electromagnetic calorimeter

Details High energy cosmic muons and the calibration of the L3 electromagnetic calorimeter High energy cosmic muons and the calibration of the L3 electromagnetic calorimeter

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8821999m&link_type=abstract

Unknown

Physics

Calibrating, Calorimeters, Cosmic Rays, Crystal Lattices, Muons, Radiation Counters, Algorithms, Boron Oxides, Particle Tracks

Scientific paper

An experiment was performed with a 10 x 10 BGO crystal matrix to define a calibration procedure with high energy cosmic muons to be applied to the calorimeter before the installation and inside the L3 electromagnetic calorimeter pit. Calibration constants were evaluated at the 2 percnet level collecting 200 muons per crystal in 10 days of data taking; an algorithm to minimize the uncertainty on the track length determination was developed, proving the feasibility of the cosmic muon calibration of the calorimeter. Muons can easily provide a set of intercalibration constants in the test period and during operation. The comparison between them will account for changes in the response of individual crystal. The absolute scale for the muon calibration constants when the calorimeter is in situ within the L3 experiment can be fixed in two ways: by physical processes in at least a fraction of the detector; and by measuring the cosmic muon momemtum by the muon spectrometer and using the dE/dx information. Since the measurement proves that the track length inside the crystal can be determined with the necessary accuracy, it is concluded that this method can be used to measure the light response of each crystal and its variation along the major axis.

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