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 fb−1 recorded at s=13TeV 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 and compared with the cross section of a vector dark matter mediator coupling to dark matter particles and quarks. Translating to a model where the narrow resonance interacts only with quarks, upper limits on this coupling range 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 flavor-inclusive dijet resonance search.
Highlights
Many models of new physics predict the existence of new massive particles coupled to quarks
New mediators interacting with both quarks and dark matter (DM) particles (χ) have been searched for using different methods: in the direct searches for DM, by measuring the recoil of an standard model (SM) particle caused by the scattering with a DM particle [14,15,16,17,18,19,20,21,22,23,24]; with astrophysics detectors, by looking for SM particles produced through the annihilation of DM particles [25,26,27,28,29,30,31,32,33,34,35,36,37,38,39]; and at hadron colliders, by detecting the momentum imbalance due to the production of DM particles [40,41,42,43,44,45,46]
The search for dijet resonances at hadron colliders can be compared with such DM searches and the results are sensitive for models where the decay of the mediator into DM particles is forbidden for kinematic reasons
Summary
Many models of new physics predict the existence of new massive particles coupled to quarks. The production and decay of these particles into two jets, known as dijets, have been searched for since the first high-energy hadron colliders came into operation [1,2,3,4,5,6,7,8,9]. In some models, these particles act as mediators linking the standard model (SM) to new physics sectors containing dark matter (DM) particle candidates [10,11,12,13]. The search for dijet resonances is sensitive to the signals predicted by other models [47,48,49,50,51,52,53,54,55,56,57]
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