Abstract
A search for new light bosons decaying into muon pairs is presented using a data sample corresponding to an integrated luminosity of 35.9fb−1 of proton-proton collisions at a center-of-mass energy s=13TeV, 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 from the predicted background is observed. A model independent limit is set on the product of the production cross section times branching fraction to dimuons squared times acceptance as a function of new light boson mass. This limit varies between 0.15 and 0.39fb over a range of new light boson masses from 0.25 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 nonnegligible light boson lifetimes. In both cases, there is significant improvement over previously published limits.
Highlights
The standard model (SM) is known to give an incomplete description of particle physics and a number of extensions of the SM predict the existence of new light bosons [1,2,3]
X → 4μ + X and is performed on a data sample collected by the Compact Muon Solenoid experiment in 2016 that corresponds to an integrated luminosity of 35.9 fb−1 proton-proton collisions at 13 TeV
Nine events are observed in the signal region (SR), with 7.95 ± 1.12 ± 1.45 events expected from the standard model (SM) backgrounds
Summary
The standard model (SM) is known to give an incomplete description of particle physics and a number of extensions of the SM predict the existence of new light bosons [1,2,3]. In this Letter, we present a model independent search for the pair production of a light boson that decays into a pair of muons. The dark photon γD decays to a pair of oppositely charged muons This analysis contributes to an existing body of experimental work in the search for new light bosons. A more thorough description of the NMSSM and dark SUSY models, their empirical and theoretical motivations, and constraints for their search set by previous experiments is included in Refs. The search presented in this Letter includes several improvements compared to the previous results published by the CMS Collaboration on light boson pair production decaying to muons given in Ref. There is a new software trigger algorithm that uses three muons instead of two and does not require the muons to come from the interaction point These changes are discussed in detail in Refs.
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