CMS-PAS-EXO-20-007

CMS-PAS-EXO-20-007
Search for high mass trijet resonances using final states with boosted dijet resonances in proton-proton collisions at $\sqrt{s}= $ 13 TeV
CMS Collaboration
June 2021

Abstract: A novel search is reported for high mass trijet resonances that decay to a jet and a boosted dijet resonance. The search uses 138 fb$^{-1}$ of integrated luminosity collected by the CMS detector in proton-proton collisions at $\sqrt{s}= $ 13 TeV. The boosted dijet resonance is reconstructed as a single jet, containing jet substructure consistent with a two-body decay. The jet substructure information and the kinematics of cascade resonance decays are exploited to disentangle the signal from the large QCD multijet background. The dijet mass spectra are analyzed for the presence of new resonances, and are found to be consistent with standard model expectations. Results are interpreted in a warped extra dimension model where the first resonance is a Kaluza-Klein (KK) gluon, the second resonance is a radion, and final state partons are all gluons. Limits on the production cross section are set as a function of KK gluon and radion masses. These limits exclude at 95% confidence level a KK gluon with a mass of 4.2TeV for a radion mass of 0.42 TeV, and a radion with a mass of 0.74 TeV for a KK gluon mass of 3.7 TeV. By exploring a novel experimental signature, we extend significantly the discovery potential of this benchmark model of new physics compared to previous searches at the LHC.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here.

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