Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 695, Issue -, Pages 293-295Publisher
ELSEVIER
DOI: 10.1016/j.nima.2011.10.025
Keywords
CMS; LHC; ECAL; Electromagnetic Calorimeter; APD; Avalanche Photodiode
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Funding
- Science and Technology Facilities Council [CMS, ST/K001256/1] Funding Source: researchfish
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Anomalous large signals are observed in the CMS Electromagnetic Calorimeter during proton-proton collisions at the Large Hadron Collider. They are ascribed to direct energy deposition by particles in the Avalanche Photodiodes (APDs) used for the light readout. Laboratory and test beam studies, as well as Monte Carlo simulations, have been used to understand their origin. The methods that have been employed to reject these signals in the online trigger of CMS and in the reconstruction of physics data are also presented. (C) 2011 Elsevier B.V. All rights reserved.
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