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001-es BibID:	BIBFORM108520
035-os BibID:	(WoS)000608484200003 (Scopus)85096366340
Első szerző:	CMS Collaboration
Cím:	Performance of the CMS Level-1 trigger in proton-proton collisions at root{s} = 13 TeV / CMS Collaboration
Dátum:	2020
ISSN:	1748-0221
Megjegyzések:	At the start of Run 2 in 2015, the LHC delivered proton-proton collisions at a center-ofmass energy of 13 TeV. During Run 2 (years 2015-2018) the LHC eventually reached a luminosity of 2.1 x 10(34) cm(-2) s(-1), almost three times that reached during Run 1 (2009-2013) and a factor of two larger than the LHC design value, leading to events with up to a mean of about 50 simultaneous inelastic proton-proton collisions per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior to 2016 to improve the selection of physics events in the challenging conditions posed by the second run of the LHC. This paper describes the performance of the CMS Level-1 trigger upgrade during the data taking period of 2016-2018. The upgraded trigger implements pattern recognition and boosted decision tree regression techniques for muon reconstruction, includes pileup subtraction for jets and energy sums, and incorporates pileup-dependent isolation requirements for electrons and tau leptons. In addition, the new trigger calculates high-level quantities such as the invariant mass of pairs of reconstructed particles. The upgrade reduces the trigger rate from background processes and improves the trigger efficiency for a wide variety of physics signals.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Large detector-systems performance Trigger algorithms
Megjelenés:	Journal of Instrumentation. - 15 : 10 (2020), p. 1-61. -
További szerzők:	Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Teyssier, Daniel Francois Ujvári Balázs (1977-) (fizikus) Zilizi Gyula (1965-) (fizikus)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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