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A search for direct production of low-mass dimuon resonances is performedusing $\sqrt{s}$ = 13 TeV proton-proton collision data collected by the CMSexperiment during the 2017-2018 operation of the CERN LHC with an integratedluminosity of 96.6 fb$^{-1}$. The search exploits a dedicated high-rate triggerstream that records events with two muons with transverse momenta as low as 3GeV but does not include the full event information. The search is performed bylooking for narrow peaks in the dimuon mass spectrum in the ranges of 1.1-2.6GeV and 4.2-7.9 GeV. No significant excess of events above the expectation fromthe standard model background is observed. Model-independent limits onproduction rates of dimuon resonances within the experimental fiducialacceptance are set. Competitive or world's best limits are set at 90%confidence level for a minimal dark photon model and for a scenario with twoHiggs doublets and an extra complex scalar singlet (2HDM+S). Values of thesquared kinetic mixing coefficient $\varepsilon^2$ in the dark photon modelabove 10$^{-6}$ are excluded over most of the mass range of the search. In the2HDM+S, values of the mixing angle $\sin(\theta_\text{H})$ above 0.08 areexcluded over most of the mass range of the search with a fixed ratio of theHiggs doublets vacuum expectation $\tan\beta$ = 0.5.

Search for direct production of GeV-scale resonances decaying to a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV