Search for dijet resonances using events with three jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The CMS collaboration
Phys.Lett.B 805 (2020) 135448, 2020.

Abstract (data abstract)
A search for a narrow resonance with a mass between 350 and 700 GeV, and decaying into a pair of jets, is performed using proton-proton collision events containing at least three jets. The data sample corresponds to an integrated luminosity of $18.3 ~\mathrm{fb}^{-1}$ recorded at $\sqrt{s}=13~\mathrm{TeV}$ with the CMS detector. Data are collected with a technique known as "data scouting", in which the events are reconstructed, selected, and recorded at a high rate in a compact form by the high-level trigger. The three-jet final state provides sensitivity to lower resonance masses than in previous searches using the data scouting technique. The spectrum of the dijet invariant mass, calculated from the two jets with the largest transverse momenta in the event, is used to search for a resonance. No significant excess over a smoothly falling background is found. Limits at 95% confidence level are set on the production cross section of a narrow dijet resonance. The corresponding upper limits on the coupling of a narrow vector resonance interacting only with quarks are between 0.10 and 0.15, depending on the resonance mass.These results represent the most stringent upper limits in the mass range between 350 and 450 GeV obtained with a search that is sensitive to the decay of the resonance into light-flavor quarks.

  • Figure 1

    Data from Figure 1.


    Dijet mass spectrum (points) compared to a fitted parameterization of the background (solid curve), where the fit is performed in...

  • Figure 2

    Data from Figure 2.


    Upper limits at 95% CL on the product of the cross section, branching fraction, and acceptance as a function of...

  • Figure 3

    Data from Figure 3.


    Figure 3: Upper limits at 95% CL on the universal quark coupling $g'_{\mathrm{q}}$ , as a function of resonance mass,...

  • Table 1

    Data from Figure 1 in Supplementary Material.


    Acceptance for a vector resonance decaying into a dijet as a function of the resonance mass. The acceptance is calculated...

  • Additional Figure 1

    Data from Figure 2 in Supplementary Material.


    Comparison of the dijet mass distribution of the nominal selection (black), control selection without correction (red), and control selection with...

  • Additional Table 1

    Data from Table 1 in Supplementary Material.


    Fraction of data and simulated signal events passing different stages of the analysis selection. The selection corresponding to each line...

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