CMS-PAS-SUS-23-018

CMS-PAS-SUS-23-018
Search for DM in association with b-quark and lepton pairs
CMS Collaboration
20 July 2024

Abstract: A search is performed for dark matter produced in association with bottom quark and lepton pairs in data collected by the CMS detector at the LHC, corresponding to 138 fb$ ^{-1} $ of proton-proton collisions at a center-of-mass energy of 13 TeV. The analysis explores for the first time at the LHC the associated production of a bottom quark-antiquark pair and a new neutral Higgs boson that subsequently decays into a Z boson and a pseudoscalar, where the latter acts as dark matter mediator in the context of the 2HDM+$ a $ model. The analysis probes final states with a pair of same-flavor leptons arising in decays of Z bosons, which tend to be produced in opposite directions with respect to the dark matter particles that originate from the decay of the pseudoscalar. The resulting imbalance in transverse momentum in combination with observables related to the lepton pair is exploited in this search. Furthermore, we make use of novel multivariate techniques that target the wide range of kinematic scenarios occurring for the various mass configurations.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

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