A search for pair production of new light bosons decaying into muons at sqrt(s)=13 TeV

This letter presents a search for new light bosons decaying into muon pairs using a data sample corresponding to an integrated luminosity of 35.9 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy $\sqrt{s} = 13$ TeV collected with the CMS detector at the CERN LHC. The search is model independent, only requiring the pair production of a new light boson and its subsequent decay to a pair of muons. No significant deviation is observed from the predicted background and a model independent limit is set on the product of the cross section, branching ratio, and acceptance as a function of mass. This limit varies between 0.16 fb and 0.45 fb over a range of new light boson masses from 0.25 GeV to 8.5 GeV. It is then interpreted in the context of the Next-to-Minimal Supersymmetric Standard Model and a dark supersymmetry model that allows for non-negligible light boson lifetimes.