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Evidence for exclusive gamma gamma to W+ W- production and constraints on anomalous quartic gauge couplings in pp collisions at sqrt(s) = 7 and 8 TeVстатья
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: 8 января 2017 г.
- Авторы: Baskakov A., Belyaev A.V., Boos E., Ershov A., Gribushin A., Kachanov V.A., Katkov I., Khein L., Klyukhin V., Kodolova O., Lokhtin I., Lukina O., Miagkov I., Obraztsov S., Petrushanko S., Popov A.A., Savrin V., Snigirev A., Zhukov V.Yu, CMS Collaboration
- Журнал: Journal of High Energy Physics
- Том: 2016
- Номер: 8
- Год издания: 2016
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 119
- DOI: 10.1007/JHEP08(2016)119
- Аннотация: A search for exclusive or quasi-exclusive gamma-gamma to W+W- production, via pp to p(*) W+W- p(*) to p(*) mu+/- e-/+ at sqrt(s)=8 TeV, is reported using data corresponding to an integrated luminosity of 19.7 inverse femtobarns. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum pt(mu+/- e-/+>) 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 inverse femtobarns of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 +/- 0.6 (0.84 +/-0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4 sigma over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive gamma-gamma to W+W- production. Upper limits on the anomalous quartic gauge coupling operators a[W;0,C] (dimension-6) and f[M0,1,2,3] (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.
- Добавил в систему: Лохтин Игорь Петрович