CMS-PAS-EXO-19-003

CMS-PAS-EXO-19-003
Search for dark matter produced in association with a Z boson in proton-proton collisions at $\sqrt{s}= $ 13 TeV
CMS Collaboration
June 2020

Abstract: A search for dark matter (DM) particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on proton-proton collision data at a center-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2016-2018, corresponding to an integrated luminosity of 137 fb$^{-1}$. The search uses the decay channels $\mathrm{Z}\to\mathrm{e}\mathrm{e}$ and $\mathrm{Z}\to\mu\mu$. No significant excess of events is observed over the background expected from standard model processes. Limits are set on DM production in the context of simplified models with vector, axial-vector, scalar, and pseudoscalar mediators, as well as a two-Higgs-doublet model with an additional pseudoscalar mediator. The limits are also provided for spin-dependent and spin-independent scattering cross sections and are compared to those from direct-detection experiments. The results are also interpreted in the context of models of invisible Higgs boson decays, unparticles, and large extra dimensions.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, EPJC 81 (2021) 13. The superseded preliminary plots can be found here.

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