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Paper   IPM / Particles / 11409
School of Particles and Accelerator
  Title:   Commissioning of the CMS High-Level Trigger with Cosmic Rays
  Author(s): 
1.  Hessamaddin Arfaei
2.  Hamed Bakhshiansohi
3.  Ali Fahim
4.  Abideh Jafari
5.  Mojtaba mohammadi najafabadi
6.  Ahmad Moshaii
7.  Saeid Paktinat
8.  Shahin Rouhani
9.  Batool Safarzadeh
10.  Maryam Zeinali
  Status:   Published
  Journal: JINST
  Year:  2010
  Pages:   31
  Supported by:  IPM
  Abstract:
The CMS High-Level Trigger (HLT) is responsible for ensuring that data samples with potentially interesting events are recorded with high efficiency and good quality. This paper gives an overview of the HLT and focuses on its commissioning using cosmic rays. The selection of triggers that were deployed is presented and the online grouping of triggered events into streams and primary datasets is discussed. Tools for online and offline data quality monitoring for the HLT are described, and the operational performance of the muon HLT algorithms is reviewed. The average time taken for the HLT selection and its dependence on detector and operating conditions are presented. The HLT performed reliably and helped provide a large dataset. This dataset has proven to be invaluable for understanding the performance of the trigger and the CMS experiment as a whole.


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