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May 21 – 26, 2017
Beijing International Convention Center
Asia/Shanghai timezone

Performance of the CMS electromagnetic calorimeter during the LHC Run II

May 25, 2017, 2:36 PM
18m
Room 305A (Beijing International Convention Center)

Room 305A

Beijing International Convention Center

No.8 Beichen Dong Road, Chaoyang District, Beijing P. R. China 100101
oral Calorimeters R1-Calorimeters(5)

Speaker

Chia-Ming Kuo (National Central University (on behalf of the CMS Collaboration))

Description

Many physics analyses using the Compact Muon Solenoid (CMS) detector at the LHC require accurate, high resolution electron and photon energy measurements. Particularly important are decays of the Higgs boson resulting in electromagnetic particles in the final state, as well as searches for very high mass resonances decaying to energetic photons or electrons. Following the excellent performance achieved in Run I at center of mass energies of 7 and 8 TeV, the CMS electromagnetic calorimeter (ECAL) is operating at the LHC with proton-proton collisions at 13 TeV center-of-mass energy. The instantaneous luminosity delivered by the LHC during Run II has achieved unprecedented values, using 25 ns bunch spacing. The average number of concurrent proton-proton collisions per bunch-crossing (pileup) has reached up to 40 interactions in 2016 and may increase further in 2017. These high pileup levels necessitate a retuning of the ECAL readout and trigger thresholds and reconstruction algorithms, to maintain the best possible performance in these more challenging conditions. The energy response of the detector must be precisely calibrated and monitored to achieve and maintain the excellent performance obtained in Run I in terms of energy scale and resolution. A dedicated calibration of each detector channel is 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.

Primary authors

Adi Bornheim (On behalf of the CMS Collaboration) Chia-Ming Kuo (National Central University (on behalf of the CMS Collaboration))

Presentation materials