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Measurement of single-diffractive dijet production in proton–proton collisions at $$\sqrt{s} = 8\,\text {Te}\text {V} $$ s = 8 Te with the CMS and TOTEM experiments
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In: Springer Berlin Heidelberg (2021)
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Measurement of single-diffractive dijet production in proton–proton collisions at $$\sqrt{s} = 8\,\text {Te}\text {V} $$ s = 8 Te with the CMS and TOTEM experiments
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In: Springer Berlin Heidelberg (2020)
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Search for production of four top quarks in final states with same-sign or multiple leptons in proton–proton collisions at $$\sqrt{s}=13$$s=13 $$\,\text {TeV}$$TeV
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Sirunyan, A. M; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Del Valle, A. E; Flechl, M.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Rad, N.; Schieck, J.; Schöfbeck, R.
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In: Springer Berlin Heidelberg (2020)
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Abstract:
Abstract The standard model (SM) production of four top quarks ($$\text {t} {}{\overline{\text {t}}} \text {t} {}{\overline{\text {t}}} $$tt¯tt¯) in proton–proton collisions is studied by the CMS Collaboration. The data sample, collected during the 2016–2018 data taking of the LHC, corresponds to an integrated luminosity of 137$$\,\text {fb}^{-1}$$fb-1 at a center-of-mass energy of 13$$\,\text {TeV}$$TeV. The events are required to contain two same-sign charged leptons (electrons or muons) or at least three leptons, and jets. The observed and expected significances for the $$\text {t} {}{\overline{\text {t}}} \text {t} {}{\overline{\text {t}}} $$tt¯tt¯ signal are respectively 2.6 and 2.7 standard deviations, and the $$\text {t} {}{\overline{\text {t}}} \text {t} {}{\overline{\text {t}}} $$tt¯tt¯ cross section is measured to be $$12.6^{+5.8}_{-5.2}\,\text {fb} $$12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, $$y_{\text {t}}$$yt, yielding a limit of $$|y_{\text {t}}/y_{\text {t}}^{\mathrm {SM}} | < 1.7$$|yt/ytSM|<1.7 at $$95\%$$95% confidence level, where $$y_{\text {t}}^{\mathrm {SM}}$$ytSM is the SM value of $$y_{\text {t}}$$yt. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, $$\hat{H}<0.12$$H^<0.12. Limits are set on the production of a heavy scalar or pseudoscalar boson in Type-II two-Higgs-doublet and simplified dark matter models, with exclusion limits reaching 350–470$$\,\text {GeV}$$GeV and 350–550$$\,\text {GeV}$$GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.
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URL: https://hdl.handle.net/1721.1/131670
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Participants Conform to Humans but Not to Humanoid Robots in an English Past Tense Formation Task
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Study of central exclusive [Image: see text] production in proton-proton collisions at [Formula: see text] and 13TeV
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In: Eur Phys J C Part Fields (2020)
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Search for dark matter produced in association with heavy-flavor quark pairs in proton-proton collisions at [Formula: see text]
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Event generator tunes obtained from underlying event and multiparton scattering measurements.
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