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Search for a heavy composite Majorana neutrino in events with dilepton signatures from 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: 20 февраля 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., Petrushanko S.V., Savrin V., CMS Collaboration
- Журнал: Physics Letters B
- Том: 843
- Год издания: 2023
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 137803
- DOI: 10.1016/j.physletb.2023.137803
- Аннотация: Results are presented of a search for a heavy Majorana neutrino N_ℓ decaying into two same-flavor leptons ℓ (electrons or muons) and a quark-pair jet. A model is considered in which the N_ℓ is an excited neutrino in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at √s= 13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb−1. The data are found to be in agreement with the standard model prediction. For the process in which the N_ℓ is produced in association with a lepton, followed by the decay of the N_ℓ to a sameflavor lepton and a quark pair, an upper limit at 95% confidence level on the product of the cross section and branching fraction is obtained as a function of the N_ℓ mass m_N_ℓ and the compositeness scale Lambda. For this model the data exclude the existence of N_e (N_μ) for m_N_ℓ below 6.0 (6.1) TeV, at the limit where m_N_ℓ is equal to Lambda. For m_N_ℓ ≈ 1 TeV, values of Lambda less than 20 (23) TeV are excluded. These results represent a considerable improvement in sensitivity, covering a larger parameter space than previous searches in pp collisions at 13 TeV.
- Добавил в систему: Клюхин Вячеслав Иванович
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