Search for top squarks in the four-body decay mode with single lepton final states in proton-proton collisions at √s = 13 TeV

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

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Дата последнего поиска статьи во внешних источниках: 17 апреля 2024 г.

Авторы: Belyaev A.V., Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Klyukhin V., Kodolova O., Obraztsov S., Perfilov M., Petrushanko S.V., Savrin V., CMS Collaboration
Журнал: Journal of High Energy Physics
Том: 2023
Номер: 6
Год издания: 2023
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 060
DOI: 10.1007/jhep06(2023)060
Аннотация: A search for the pair production of the lightest supersymmetric partner of the top quark, the top squark (˜t_1), is presented. The search targets the four-body decay of the ˜t_1, which is preferred when the mass diﬀerence between the top squark and the lightest supersymmetric particle is smaller than the mass of the W boson. This decay mode consists of a bottom quark, two other fermions, and the lightest neutralino (χ˜0_1), which is assumed to be the lightest supersymmetric particle. The data correspond to an integrated luminosity of 138 fb−1 of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC. Events are selected using the presence of a high-momentum jet, an electron or muon with low transverse momentum, and a signiﬁcant missing transverse momentum. The signal is selected based on a multivariate approach that is optimized for the diﬀerence between m(˜t_1) and m(χ˜0_1). The contribution from leading background processes is estimated from data. No signiﬁcant excess is observed above the expectation from standard model processes. The results of this search exclude top squarks at 95% conﬁdence level for masses up to 480 and 700 GeV for m(˜t_1) −m(χ˜0_1) = 10 and 80 GeV, respectively.
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Search for top squarks in the four-body decay mode with single lepton final states in proton-proton collisions at √s = 13 TeVстатья Исследовательская статья

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