CMS-PAS-EXO-24-007

CMS-PAS-EXO-24-007
Search for low mass vector and scalar resonances decaying into quark-antiquark pairs
CMS Collaboration
19 July 2024

Abstract: A search for low mass resonances decaying into quark-antiquark pairs is presented. The analysis uses proton-proton collision data at $ \sqrt{s}= $ 13 TeV collected by the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The search targets resonances with masses from 50 to 300 GeV, produced in association with large initial-state radiation. Two coupling scenarios are considered, with the resonances coupling either equally to all flavors of quark or preferentially to bottom quarks. The resonances are reconstructed as large-radius jets with two-pronged substructure and are identified using the ParticleNet algorithm. Separate signal regions are defined to target resonances decaying to light- or heavy-flavor quarks. The invariant jet mass spectrum is scrutinized for narrow excesses over a smoothly falling background. No evidence for such resonances is observed, and limits are set on the couplings of new scalar and vector resonances to quarks. For dijet resonances with masses from 50-300 GeV, these are the most sensitive limits to date.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here.

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