Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at √s = 13 TeV

Belyaev, A.V.; Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Ershov, A.A.; Gribushin, A.; Klyukhin, V.; Kodolova, O.; Obraztsov, S.; Savrin, V.; Snigirev, A.; CMS, C.

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Дата последнего поиска статьи во внешних источниках: 1 мая 2024 г.

Авторы: Belyaev A.V., Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Gribushin A., Klyukhin V., Kodolova O., Obraztsov S., Savrin V., Snigirev A., CMS Collaboration
Журнал: Journal of High Energy Physics
Том: 2023
Номер: 07
Год издания: 2023
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 210
DOI: 10.1007/JHEP07(2023)210
Аннотация: A search for long-lived particles decaying in the outer regions of the CMS silicon tracker or in the calorimeters is presented. The search is based on a data sample of proton-proton collisions at √s = 13 TeV recorded with the CMS detector at the LHC in 2016–2018, corresponding to an integrated luminosity of 138 fb−1. A novel technique, using nearly trackless and out-of-time jet information combined in a deep neural network discriminator, is employed to identify decays of long-lived particles. The results are interpreted in a simpliﬁed model of chargino-neutralino production, where the neutralino is the next-to-lightest supersymmetric particle, is long-lived, and decays to a gravitino and either a Higgs or Z boson. This search is most sensitive to neutralino proper decay lengths of approximately 0.5 m, for which masses up to 1.18 TeV are excluded at 95% conﬁdence level. The current search is the best result to date in the mass range from the kinematic limit imposed by the Higgs boson mass up to 1.8 TeV.
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Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at √s = 13 TeVстатья Исследовательская статья

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