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Free, publicly-accessible full text available December 1, 2024
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Free, publicly-accessible full text available November 1, 2024
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Free, publicly-accessible full text available November 1, 2024
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Abstract A description is presented of the algorithms used to reconstruct energy deposited in the CMS hadron calorimeter during Run 2 (2015–2018) of the LHC. During Run 2, the characteristic bunch-crossing spacing for proton-proton collisions was 25 ns, which resulted in overlapping signals from adjacent crossings. The energy corresponding to a particular bunch crossing of interest is estimated using the known pulse shapes of energy depositions in the calorimeter, which are measured as functions of both energy and time. A variety of algorithms were developed to mitigate the effects of adjacent bunch crossings on local energy reconstruction in the hadron calorimeter in Run 2, and their performance is compared.
Free, publicly-accessible full text available November 1, 2024 -
Free, publicly-accessible full text available November 1, 2024
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Abstract A generic search is presented for the associated production of a Z boson or a photon with an additional unspecified massive particle X,
, in proton-tagged events from proton–proton collisions at$${\textrm{pp}}\rightarrow {\textrm{pp}} +{{\textrm{Z}}}/\upgamma +{{\textrm{X}}} $$ , recorded in 2017 with the CMS detector and the CMS-TOTEM precision proton spectrometer. The missing mass spectrum is analysed in the 600–1600 GeV range and a fit is performed to search for possible deviations from the background expectation. No significant excess in data with respect to the background predictions has been observed. Model-independent upper limits on the visible production cross section of$$\sqrt{s}=13\, \textrm{TeV}$$ are set.$${\textrm{pp}}\rightarrow {\textrm{pp}} +{{\textrm{Z}}}/\upgamma +{{\textrm{X}}} $$ Free, publicly-accessible full text available September 1, 2024 -
Free, publicly-accessible full text available November 1, 2024
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Abstract 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
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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Free, publicly-accessible full text available October 1, 2024