CMS high level trigger performance in run 2

Sert H.

27th Symposium on Nuclear Electronics and Computing, NEC 2019, Budva, Karadağ, 30 Eylül - 04 Ekim 2019, cilt.2507, sa.7425074, ss.58-64 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 2507
  • Basıldığı Şehir: Budva
  • Basıldığı Ülke: Karadağ
  • Sayfa Sayıları: ss.58-64
  • Anahtar Kelimeler: CMS, HL-LHC, HLT, LHC
  • İstanbul Üniversitesi Adresli: Hayır

Özet

The CMS experiment selects events with a two-level trigger system, the Level-1 (L1) trigger and the High Level trigger (HLT). The HLT is a farm of approximately 30K CPU cores that reduces the rate from 100 kHz to about 1 kHz. The HLT has access to the full detector readout and runs a streamlined version of the offline event reconstruction. In LHC Run 2 the peak instantaneous luminosity reached values around 2×1034 cm−2s−1, posing a challenge to the online event selection. An overview of the object reconstruction and trigger selections used in the 2016-2018 data-taking period will be presented. The performance of the main trigger paths and the lessons learned will be summarised, also in view of the coming LHC Run 3.