Search for dark matter produced in association with a leptonically decaying ${\mathrm{Z}} $ boson in proton–proton collisions at $\sqrt{s}=13\,\text {Te}\text {V} $

A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, A. Escalante Del Valle, R. Frühwirth, M. Jeitler, N. Krammer, L. Lechner, D. Liko (+2307 others)
A search for dark matter particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on protonproton 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 Z → ee and Z → μμ. No significant excess of events is observed over the background expected from the standard model. Limits are set on
more » ... dark matter particle production in the context of simplified models with vector, axial-vector, scalar, and pseudoscalar mediators, as well as on a two-Higgs-doublet model with an additional pseudoscalar mediator. In addition, limits are 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. 13
doi:10.5445/ir/1000129390 fatcat:tn5jbhgn5bcnrp546abktzbgku