A search for decays to invisible particles of Higgs bosons produced in association with a top-antitop quark pair or a vector boson, which both decay to a fully hadronic final state, has been performed using proton-proton collision data collected at
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Abstract by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138$${\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V}}$$ . The 95% confidence level upper limit set on the branching fraction of the 125$$\,\text {fb}^{-1}$$ Higgs boson to invisible particles,$$\,\text {Ge}\hspace{-.08em}\text {V}$$ , is 0.54 (0.39 expected), assuming standard model production cross sections. The results of this analysis are combined with previous$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ searches carried out at$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ , 8, and 13$${\sqrt{s}=7}$$ in complementary production modes. The combined upper limit at 95% confidence level on$$\,\text {Te}\hspace{-.08em}\text {V}$$ is 0.15 (0.08 expected).$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ Free, publicly-accessible full text available October 1, 2024 -
Free, publicly-accessible full text available October 1, 2024
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A bstract A measurement of the top quark pole mass
in events where a top quark-antiquark pair ($$ {m}_{\textrm{t}}^{\textrm{pole}} $$ ) is produced in association with at least one additional jet ($$ \textrm{t}\overline{\textrm{t}} $$ +jet) is presented. This analysis is performed using proton-proton collision data at$$ \textrm{t}\overline{\textrm{t}} $$ = 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to a total integrated luminosity of 36.3 fb$$ \sqrt{s} $$ − 1. Events with two opposite-sign leptons in the final state (e+e− ,μ +μ − , e± μ ∓) are analyzed. The reconstruction of the main observable and the event classification are optimized using multivariate analysis techniques based on machine learning. The production cross section is measured as a function of the inverse of the invariant mass of the +jet system at the parton level using a maximum likelihood unfolding. Given a reference parton distribution function (PDF), the top quark pole mass is extracted using the theoretical predictions at next-to-leading order. For the ABMP16NLO PDF, this results in$$ \textrm{t}\overline{\textrm{t}} $$ = 172$$ {m}_{\textrm{t}}^{\textrm{pole}} $$ . 93± 1. 36 GeV.Free, publicly-accessible full text available July 1, 2024 -
Free, publicly-accessible full text available July 1, 2024