Online Event Selection at the CMS Experiment | Zendy

M. Konecki | Zendy

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Online Event Selection at the CMS Experiment

Author(s) -

M. Konecki

Publication year - 2004

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.1807322

Subject(s) - event (particle physics) , large hadron collider , selection (genetic algorithm) , computer science , task (project management) , reduction (mathematics) , object (grammar) , identification (biology) , real time computing , computer hardware , particle physics , physics , artificial intelligence , systems engineering , engineering , geometry , mathematics , botany , quantum mechanics , biology

Triggering in the high‐rate environment of the LHC is a challenging task. The CMS experiment has developed a two‐stage trigger system. The Level‐1 Trigger is based on custom hardware devices and is designed to reduce the 40 MHz LHC bunch‐crossing rate to a maximum event rate of ∼ 100 kHz. The further reduction of the event rate to O(100 Hz), suitable for permanent storage, is performed in the High‐Level Trigger (HLT) which is based on a farm of commercial processors. The methods used for object identification and reconstruction are presented. The CMS event selection strategy is discussed. The performance of the HLT is also given.

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