Abstract
Various calibration techniques for the CMS Hadron calorimeter in Run 2 and the results of calibration using 2016 collision data are presented. The radiation damage corrections, intercalibration of different channels using the phi-symmetry technique for barrel, endcap and forward calorimeter regions are described, as well as the intercalibration with muons of the outer hadron calorimeter. The achieved intercalibration precision is within 3%. The in situ energy scale calibration is performed in the barrel and endcap regions using isolated charged hadrons and in the forward calorimeter using the Zarrow ee process. The impact of pileup and the developed technique of correction for pileup is also discussed. The achieved uncertainty of the response to hadrons is 3.4% in the barrel and 2.6% in the endcap region (at the pseudorapidity range |η|<2) and is dominated by the systematic uncertainty due to pileup contributions.
Highlights
Various calibration techniques for the CMS Hadron calorimeter in Run[2] and the results of calibration using 2016 collision data are presented
The achieved intercalibration precision is within 3%
The in situ energy scale calibration is performed in the barrel and endcap regions using isolated charge hadrons and in the forward calorimeter using the Z → ee process
Summary
The high level of radiation originating from particles produced in beam-beam interactions leads to a deterioration of the light collection from the active material of the HCAL calorimeters. The effect of radiation damage on the HE and HF performance in Run 2 data taking period is investigated in the offline analysis based on the collision data, and by means of the measurement with the dedicated laser system. The radiation damage measurement with the collision data relies on a time-dependent comparison of energy deposition in calorimeter channels using the events of inclusive Z boson production. The radiation damage is calculated with respect to pseudorapidity ring |iη| = 16 and normalized to the response at the beginning of the data taking period. The laser and collision data measurements of the radiation damage in the HE give consistent results
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