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Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at sqrt(s) = 13 TeVстатья
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: 25 августа 2021 г.
- Авторы: Belyaev A.V., Boos E., Dubinin M., Dudko L., Ershov A.A., Katkov I., Klyukhin V., Kodolova O., Lokhtin I., Obraztsov S., Perfilov M., Petrushanko S., Savrin V., Snigirev A., CMS Collaboration
- Журнал: Physics Letters B
- Том: 819
- Год издания: 2021
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 136409
- DOI: 10.1016/j.physletb.2021.136409
- Аннотация: A search is performed for the rare decay W±→π±γ in proton-proton collisions at s√= 13 TeV. Data corresponding to an on W integrated luminosity of 137 fb−1 were collected during 2016 to 2018 with the CMS detector. This analysis exploits a novel search strategy based on W boson production in top quark pair events. An inclusive search for the W±→π±γ decay is not optimal at the LHC because of the high trigger thresholds. Instead, a trigger selection is exploited in which the W boson originating from one of the top quarks is used to tag the event in a leptonic decay. The W boson emerging from the other top quark is used to search for the W±→π±γ signature. Such decays are characterized by an isolated track pointing to a large energy deposit, and by an isolated photon of large transverse momentum. The presence of b quark jets reduces the background from the hadronization of light-flavor quarks and gluons. The W±→π±γ decay is not observed. An upper exclusion limit is set to this branching fraction, corresponding to 1.50 × 10−5 at 95% confidence level, whereas the expected upper limit exclusion limit is 0.85 +0.52−0.29 × 10−5.
- Добавил в систему: Лохтин Игорь Петрович