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Search for heavy pseudoscalar and scalar bosons decaying to a top quark pair in proton–proton collisions at √s = 13 TeVстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 23 января 2026 г.
- Авторы: Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Gribushin A., Klyukhin V., Kodolova O., Petrushanko S., Savrin V., Snigirev A., CMS Collaboration
- Журнал: Reports on Progress in Physics
- Том: 88
- Номер: 12
- Год издания: 2025
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 127801
- DOI: 10.1088/1361-6633/ae2207
- Аннотация: A search for pseudoscalar or scalar bosons decaying to a top quark pair (tt¯) in final states with one or two charged leptons is presented. The analyzed proton–proton collision data was recorded at √s = 13 TeV by the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 138 fb−1. The invariant mass m_tt¯ of the reconstructed tt¯ system and variables sensitive to its spin and parity are used to discriminate against the standard model tt¯ background. Interference between pseudoscalar or scalar boson production and the standard model tt¯ continuum is included, leading to peak-dip structures in the m_tt¯ distribution. An excess of the data above the background prediction, based on perturbative quantum chromodynamics (QCD) calculations, is observed near the kinematic tt¯ production threshold, while good agreement is found for high m_tt¯. The data are consistent with the background prediction if the contribution from a simplified model of a color-singlet 1S^[1]_0 tt¯ quasi-bound state η_t, inspired by nonrelativistic QCD, is added. Upper limits at 95% confidence level are set on the coupling between the pseudoscalar or scalar bosons and the top quark for boson masses in the range 365–1000 GeV, relative widths between 0.5% and 25%, and two background scenarios with or without _contribution.
- Добавил в систему: Клюхин Вячеслав Иванович
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