July 29, 2019 to August 2, 2019
Northeastern University
US/Eastern timezone

Calibration and Performance of the CMS Electromagnetic Calorimeter in LHC Run 2

Aug 1, 2019, 3:12 PM
18m
West Village G 108 (Northeastern University)

West Village G 108

Northeastern University

Oral Presentation Particle Detectors Particle Detectors

Speaker

Badder Marzocchi (Northeastern University (US))

Description

Many physics analyses using the Compact Muon Solenoid (CMS) detector at the LHC require accurate, high-resolution electron and photon energy measurements. Excellent energy resolution is crucial for studies of Higgs boson decays with electromagnetic particles in the final state, as well as searches for additional intermediate or high-mass resonances decaying to energetic photons or electrons. The CMS electromagnetic calorimeter (ECAL) is a fundamental instrument for these analyses and its energy resolution is crucial for the Higgs boson mass measurement. Recently the energy response of the calorimeter has been precisely calibrated exploiting the full Run 2 data, aiming at a legacy reprocessing of the data. A dedicated calibration of each detector channel has been performed with physics events exploiting electrons from W and Z boson decays, photons from pi0/eta decays, and from the azimuthally symmetric energy distribution of minimum bias events. This talk presents the calibration strategies that have been implemented and the excellent performance achieved by the CMS ECAL with the ultimate calibration of Run 2 data, in terms of energy scale stability and energy resolution.

Presentation materials