CMS-DP-2016/011

CMS ECAL energy inter-calibration precision with 2015 data

Abstract: Precision of the energy inter-calibrations of the CMS ECAL achieved with the 2015 data.

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2015 inter-calibration precision Residual miscalibration of the ECAL Barrel (EB) channel inter-calibration, as a function of pseudo-rapidity with the dataset recorded during 2015. The red, blue and green points represent the residual miscalibration of the intercalibration constants obtained with three different methods, and the black points represent the residual miscalibration of the combination of the three methods. The red points show the residual miscalibration of the intercalibrations derived with Run1 data, extrapolated to 2015 using the laser monitoring system response, and corrected using the φ-symmetry of the low energy deposits in the 2015 dataset. The green points show the residual miscalibration of the intercalibration constants obtained using photons from π0→γγ decays. The blue points show the residual miscalibration of the intercalibration constants obtained using electrons from W and Z decay .The black points represent the residual miscalibration of the combination of the three methods (weighted average). The precision of the φ-symmetry and π0 calibrations is at the level of the systematic errors. The precision of the electron calibration is dominated by the statistical errors with the dataset recorded in 2015 (2.6 fb-1). References: CMS DP 2013/007

-- EmanueleDiMarco - 2016-05-20