Performance of the CMS Level-1 trigger in proton-proton collisions at √s = 13 TeV; Journal of Instrumentation; Vol. 15, iss. 10

Performance of the CMS Level-1 trigger in proton-proton collisions at √s = 13 TeV; Journal of Instrumentation; Vol. 15, iss. 10

Detalhes bibliográficos
Parent link:Journal of Instrumentation
Vol. 15, iss. 10.— 2020.— [P10017, 60 p.]
Autor Corporativo: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Outros Autores: Sirunyan A. M., Tumasyan A. R., Adam W. Wolfgang, Ambrogi F. Federico, Tyurin N. E. Nikolay Evgenjevich, Babaev A. A. Anton Anatoljevich, Okhotnikov V. V. Vitaly Vladimirovich
Resumo:Title screen
At the start of Run 2 in 2015, the LHC delivered proton-proton collisions at a center-of-mass energy of 13\TeV. During Run 2 (years 2015-2018) the LHC eventually reached a luminosity of 2.1× 1034 cm-2s-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.
Idioma:inglês
Publicado em: 2020
Assuntos:
электронный ресурс
труды учёных ТПУ
large detector-systems performance
trigger algorithms
детекторные устройства
алгоритмы
Acesso em linha:https://doi.org/10.1088/1748-0221/15/10/P10017
Formato: MixedMaterials Recurso Electrónico Capítulo de Livro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664742

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