Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/8768
Title: The CMS trigger system
Authors: Khachatryan, V.
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Asilar, E.
Bergauer, T.
Karapınar, Güler
CMS Collaboration
Karapınar, Güler
Izmir Institute of Technology. Mathematics
Keywords: Trigger concepts and systems (hardware and software)
Trigger detectors
Data acquisition circuits
Issue Date: 2017
Publisher: IOP Publishing Ltd.
Abstract: This paper describes the CMS trigger system and its performance during Run 1 of the LHC. The trigger system consists of two levels designed to select events of potential physics interest from a GHz (MHz) interaction rate of proton-proton (heavy ion) collisions. The first level of the trigger is implemented in hardware, and selects events containing detector signals consistent with an electron, photon, muon, tau lepton, jet, or missing transverse energy. A programmable menu of up to 128 object-based algorithms is used to select events for subsequent processing. The trigger thresholds are adjusted to the LHC instantaneous luminosity during data taking in order to restrict the output rate to 100 kHz, the upper limit imposed by the CMS readout electronics. The second level, implemented in software, further refines the purity of the output stream, selecting an average rate of 400 Hz for offline event storage. The objectives, strategy and performance of the trigger system during the LHC Run 1 are described.
Description: WOS: 000395769600020
URI: https://doi.org/10.1088/1748-0221/12/01/P01020
https://hdl.handle.net/11147/8768
ISSN: 1748-0221
Appears in Collections:WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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