Search for the decay of a Higgs boson in the l l gamma channel in proton-proton collisions at sqrt(s) = 13 TeVстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 28 сентября 2021 г.
Аннотация:A search for a Higgs boson decaying into a pair of electrons or muons and a photon is described. Higgs boson decays to a Z boson and a photon (H → Zγ→ℓℓγ, ℓ= e or μ), or to two photons, one of which has an internal conversion into a muon pair (H →γ∗γ→μμγ) were considered. The analysis is performed using a data set recorded by the CMS experiment at the LHC from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. No significant excess above the background prediction has been found. Limits are set on the cross section for a standard model Higgs boson decaying to opposite-sign electron or muon pairs and a photon. The observed limits on cross section times the corresponding branching fractions vary between 1.4 and 4.0 (6.1 and 11.4) times the standard model cross section for H →γ∗γ→μμγ (H → Zγ→ℓℓγ) in the 120-130 GeV mass range of the ℓℓγ system. The H →γ∗γ→μμγ and H → Zγ→ℓℓγ analyses are combined for mH= 125 GeV, obtaining an observed (expected) 95% confidence level upper limit of 3.9 (2.0) times the standard model cross section.