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Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at sqrt(s)=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: 28 мая 2015 г.
- Авторы: Belyaev A., Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A., Gribushin A., Katkov I., Klyukhin V., Lokhtin I., Obraztsov S., Perfilov M., Popov A.A., Savrin V., Snigirev A., CMS Collaboration
- Журнал: European Physical Journal C
- Том: 74
- Номер: 9
- Год издания: 2014
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 3060
- DOI: 10.1140/epjc/s10052-014-3060-7
- Аннотация: A measurement of the cross section for the production of top quark–antiquark pairs ( tt⎯ ) in association with a vector boson V (W or Z) in proton-proton collisions at s√=8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb−1 recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and \upmu ) channels: a same-sign dilepton analysis targeting tt⎯W events, and trilepton and four-lepton analyses designed for tt⎯Z events. In the same-sign dilepton channel, the tt⎯W cross section is measured as σtt⎯W=170+90−80(stat)±70(syst)fb , corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the tt⎯Z cross section, σtt⎯Z=200+80−70(stat)+40−30(syst)fb−1 , is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive tt⎯V process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.
- Добавил в систему: Лохтин Игорь Петрович