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Measurement of t tbar normalised multi-differential cross sections in pp collisions at sqrt(s) = 13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functionsстатья
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: 16 декабря 2020 г.
- Авторы: Baskakov A., Belyaev A.V., Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Katkov I., Klyukhin V., Lokhtin I., Obraztsov S., Perfilov M., Savrin V., Volkov P., CMS Collaboration
- Журнал: European Physical Journal C
- Том: 80
- Номер: 7
- Год издания: 2020
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 658
- DOI: 10.1140/epjc/s10052-020-7917-7
- Аннотация: Normalised multi-differential cross sections for top quark pair (tt¯) production are measured in proton-proton collisions at a centre-of-mass energy of 13 TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9 fb−1. The double-differential tt¯ cross section is measured as a function of the kinematic properties of the top quark and of the tt¯ system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the tt¯ system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength αS and the top quark pole mass (mpoleT) using several sets of parton distribution functions (PDFs). Furthermore, a simultaneous fit of the PDFs, αS, and mpoleT is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of αS and mpoleT.
- Добавил в систему: Лохтин Игорь Петрович