CMS Level-1 Electron/Photon trigger performance

Nadir Daci; Alexandre Zabi

CMS Level-1 Electron/Photon trigger performance

Université Paris-Sud

Research output: Contribution to journal › Conference article › peer-review

Abstract

Since March 2010 the Large Hadron Collider (LHC) has provided high energy proton collisions with an instantaneous luminosity that has risen by several orders of magnitude to around 4 × 10³³cm^-2s^-1 at the end of 2011 corresponding to millions of collisions per second. With this unprecedented collision rate, efficient triggering on electrons and photons has become a major challenge for LHC experiments. The Compact Muon Solenoid (CMS) experiment uses a twolevel trigger system. The first level (L1) is based on coarse information coming from calorimeters and muon detectors, accepting up to 100kHz of events per second. A High-Level Trigger (HLT) then combines fine-grain information from all sub-detectors to reduce this rate further to about 200-300Hz. At L1 the electron/photon trigger is based upon information from the Electromagnetic Calorimeter (ECAL), a high resolution detector comprising 75848 lead tungstate (PbWO4) crystals in a "barrel" and two "endcaps". The optimization and performance of this system in terms of electron and photon triggering efficiency are presented.

Original language	English
Journal	Proceedings of Science
Volume	2011-July
Publication status	Published - 1 Jan 2011
Externally published	Yes
Event	21st International Europhysics Conference on High Energy Physics, EPS-HEP 2011 - Grenoble, RhoneAlpes, France Duration: 21 Jul 2011 → 27 Jul 2011

Cite this

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title = "CMS Level-1 Electron/Photon trigger performance",

abstract = "Since March 2010 the Large Hadron Collider (LHC) has provided high energy proton collisions with an instantaneous luminosity that has risen by several orders of magnitude to around 4 × 1033cm-2s-1 at the end of 2011 corresponding to millions of collisions per second. With this unprecedented collision rate, efficient triggering on electrons and photons has become a major challenge for LHC experiments. The Compact Muon Solenoid (CMS) experiment uses a twolevel trigger system. The first level (L1) is based on coarse information coming from calorimeters and muon detectors, accepting up to 100kHz of events per second. A High-Level Trigger (HLT) then combines fine-grain information from all sub-detectors to reduce this rate further to about 200-300Hz. At L1 the electron/photon trigger is based upon information from the Electromagnetic Calorimeter (ECAL), a high resolution detector comprising 75848 lead tungstate (PbWO4) crystals in a {"}barrel{"} and two {"}endcaps{"}. The optimization and performance of this system in terms of electron and photon triggering efficiency are presented.",

author = "Nadir Daci and Alexandre Zabi",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s).; 21st International Europhysics Conference on High Energy Physics, EPS-HEP 2011 ; Conference date: 21-07-2011 Through 27-07-2011",

year = "2011",

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day = "1",

language = "English",

volume = "2011-July",

journal = "Proceedings of Science",

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T1 - CMS Level-1 Electron/Photon trigger performance

AU - Daci, Nadir

AU - Zabi, Alexandre

N1 - Publisher Copyright: © Copyright owned by the author(s).

PY - 2011/1/1

Y1 - 2011/1/1

N2 - Since March 2010 the Large Hadron Collider (LHC) has provided high energy proton collisions with an instantaneous luminosity that has risen by several orders of magnitude to around 4 × 1033cm-2s-1 at the end of 2011 corresponding to millions of collisions per second. With this unprecedented collision rate, efficient triggering on electrons and photons has become a major challenge for LHC experiments. The Compact Muon Solenoid (CMS) experiment uses a twolevel trigger system. The first level (L1) is based on coarse information coming from calorimeters and muon detectors, accepting up to 100kHz of events per second. A High-Level Trigger (HLT) then combines fine-grain information from all sub-detectors to reduce this rate further to about 200-300Hz. At L1 the electron/photon trigger is based upon information from the Electromagnetic Calorimeter (ECAL), a high resolution detector comprising 75848 lead tungstate (PbWO4) crystals in a "barrel" and two "endcaps". The optimization and performance of this system in terms of electron and photon triggering efficiency are presented.

AB - Since March 2010 the Large Hadron Collider (LHC) has provided high energy proton collisions with an instantaneous luminosity that has risen by several orders of magnitude to around 4 × 1033cm-2s-1 at the end of 2011 corresponding to millions of collisions per second. With this unprecedented collision rate, efficient triggering on electrons and photons has become a major challenge for LHC experiments. The Compact Muon Solenoid (CMS) experiment uses a twolevel trigger system. The first level (L1) is based on coarse information coming from calorimeters and muon detectors, accepting up to 100kHz of events per second. A High-Level Trigger (HLT) then combines fine-grain information from all sub-detectors to reduce this rate further to about 200-300Hz. At L1 the electron/photon trigger is based upon information from the Electromagnetic Calorimeter (ECAL), a high resolution detector comprising 75848 lead tungstate (PbWO4) crystals in a "barrel" and two "endcaps". The optimization and performance of this system in terms of electron and photon triggering efficiency are presented.

M3 - Conference article

AN - SCOPUS:85040689802

SN - 1824-8039

VL - 2011-July

JO - Proceedings of Science

JF - Proceedings of Science

T2 - 21st International Europhysics Conference on High Energy Physics, EPS-HEP 2011

Y2 - 21 July 2011 through 27 July 2011

ER -

CMS Level-1 Electron/Photon trigger performance

Abstract

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