Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeV

Belyaev, A.V.; Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Gribushin, A.; Klyukhin, V.; Kodolova, O.; Obraztsov, S.; Perfilov, M.; Petrushanko, S.; Savrin, V.; 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: 17 апреля 2024 г.

Авторы: Belyaev A.V., Boos E., Bunichev V., Dubinin M., Dudko L., Gribushin A., Klyukhin V., Kodolova O., Obraztsov S., Perfilov M., Petrushanko S., Savrin V., CMS Collaboration
Журнал: Journal of High Energy Physics
Том: 2023
Номер: 5
Год издания: 2023
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 233
DOI: 10.1007/jhep05(2023)233
Аннотация: Results are presented from a search for the Higgs boson decay H → Zγ, where Z → ℓ+ℓ− with ℓ = e or µ. The search is performed using a sample of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb−1. Events are assigned to mutually exclusive categories, which exploit diﬀerences in both event topology and kinematics of distinct Higgs production mechanisms to enhance signal sensitivity. The signal strength µ, deﬁned as the product of the cross section and the branching fraction [σ(pp → H)B(H → Zγ)] relative to the standard model prediction, is extracted from a simultaneous ﬁt to the ℓ+ℓ−γ invariant mass distributions in all categories and is measured to be µ = 2.4 ± 0.9 for a Higgs boson mass of 125.38 GeV. The statistical signiﬁcance of the observed excess of events is 2.7 standard deviations. This measurement corresponds to σ(pp → H)B(H → Zγ) = 0.21 ± 0.08 pb. The observed (expected) upper limit at 95% conﬁdence level on µ is 4.1 (1.8), where the expected limit is calculated under the background-only hypothesis. The ratio of branching fractions B(H → Zγ)/B(H → γγ) is measured to be 1.5+0.7−0.6, which agrees with the standard model prediction of 0.69 ±0.04 at the 1.5 standard deviation level.
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Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at √s = 13 TeVстатья Исследовательская статья

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