Search for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson

Belyaev, A.V.; Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Ershov, A.A.; Klyukhin, V.; Obraztsov, S.; Perfilov, M.; Petrushanko, S.V.; Savrin, V.; Volkov, P.; CMS, C.

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., Klyukhin V., Obraztsov S., Perfilov M., Petrushanko S.V., Savrin V., Volkov P., CMS Collaboration
Журнал: Physical Review D
Том: 108
Год издания: 2023
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 032008
DOI: 10.1103/PhysRevD.108.032008
Аннотация: A data sample containing top quark pairs (tt¯) produced in association with a Lorentz-boosted Z or Higgs boson is used to search for signs of new physics using effective field theory. The data correspond to an integrated luminosity of 138 fb−1 of proton-proton collisions produced at a center-of-mass energy of 13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton and hadronic jets, including two identified with the decay of bottom quarks, plus an additional large-radius jet with high transverse momentum identified as a Z or Higgs boson decaying to a bottom quark pair. Machine learning techniques are employed to discriminate between tt¯Z or tt¯H events and events from background processes, which are dominated by tt¯ + jets production. No indications of new physics are observed. The signal strengths of boosted tt¯Z and tt¯H production are measured, and upper limits are placed on the tt¯Z and tt¯H differential cross sections as functions of the Z or Higgs boson transverse momentum. The effects of new physics are probed using a framework in which the standard model is considered to be the low-energyeffective field theory of a higher energy scale theory. Eight possible dimension-six operators are added to the standard model Lagrangian, and their corresponding coefficients are constrained via fits to the data.
Добавил в систему: Клюхин Вячеслав Иванович

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Search for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs bosonстатья Исследовательская статья

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