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Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb−1 of pp collisions at √s=13 TeV with the ATLAS experimentстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 24 января 2020 г.
- Авторы: Boldyrev A.S., Denisov S.P., Gladilin L.K., Korotkova N.A., Kramarenko V.A., Maevsky A.S., Meshkov O.V., Sinetckii V.V., Sivoklokov S.Yu, Smirnova L.N., Turchikhin S.M., ATLAS Collaboration
- Журнал: Physics Letters B
- Том: 800
- Номер: 135082
- Год издания: 2020
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 1
- Последняя страница: 21
- DOI: 10.1016/j.physletb.2019.135082
- Аннотация: A search for flavour-changing neutral current (FCNC) events via the coupling of a top quark, a photon, and an up or charm quark is presented using 81 fb−1of proton–proton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. Events with a photon, an electron or muon, a b-tagged jet, and missing transverse momentum are selected. A neural network based on kinematic variables differentiates between events from signal and background processes. The data are consistent with the background-only hypothesis, and limits are set on the strength of the tqγ coupling in an effective field theory. These are also interpreted as 95% CL upper limits on the cross section for FCNC tγ production via a left-handed (right-handed) tuγcoupling of 36 fb (78 fb) and on the branching ratio for t→γu of 2.8 ×10−5(6.1 ×10−5). In addition, they are interpreted as 95% CL upper limits on the cross section for FCNC tγ production via a left-handed (right-handed) tcγcoupling of 40 fb (33 fb) and on the branching ratio for t→γcof 22 ×10−5(18 ×10−5).
- Добавил в систему: Гладилин Леонид Константинович