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A search for exotic decays of the Higgs boson to a pair of light pseudoscalarparticles a$_1$ is performed under the hypothesis that one of the pseudoscalarsdecays to a pair of opposite sign muons and the other decays tob$\overline{\mathrm{b}}$. Such signatures are predicted in a number ofextensions of the standard model (SM), including next-to-minimal supersymmetryand two-Higgs-doublet models with an additional scalar singlet. The results arebased on a data set of proton-proton collisions corresponding to an integratedluminosity of 35.9 fb$^{-1}$, accumulated with the CMS experiment at the CERNLHC in 2016 at a centre-of-mass energy of 13 TeV. No statistically significantexcess is observed with respect to the SM backgrounds in the search region forpseudoscalar masses from 20 GeV to half of the Higgs boson mass. Upper limitsat 95% confidence level are set on the product of the production cross sectionand branching fraction, $\sigma_{\mathrm{h}}\mathcal{B}$(h $\to$ a$_1$ a$_1$$\to$ $\mu^+\mu^-\mathrm{b}\bar{\mathrm{b}}$), ranging from 5 to 33 fb,depending on the pseudoscalar mass. Corresponding limits on the branchingfraction, assuming the SM prediction for $\sigma_{\mathrm{h}}$, are(1$-$7)$\times$ 10$^{-4}$.

physics letters b

Search for an exotic decay of the Higgs boson to a pair of light  pseudoscalars in the final state with two muons and two b quarks in pp  collisions at 13 TeV