CMS Collaboration2018-12-062018-12-062016CMS Collaboration. "Search for a very light NMSSM Higgs boson produced in decays of the 125 GeV scalar boson and decaying into τ leptons in pp collisions at s√=8 TeV." <i>Journal of High Energy Physics,</i> 2016, (2016) Springer: https://doi.org/10.1007/JHEP01(2016)079.https://hdl.handle.net/1911/103796A search for a very light Higgs boson decaying into a pair of τ leptons is presented within the framework of the next-to-minimal supersymmetric standard model. This search is based on a data set corresponding to an integrated luminosity of 19.7 fb−1 of proton-proton collisions collected by the CMS experiment at a centre-of-mass energy of 8 TeV. The signal is defined by the production of either of the two lightest scalars, h1 or h2, via gluon-gluon fusion and subsequent decay into a pair of the lightest Higgs bosons, a1 or h1. The h1 or h2 boson is identified with the observed state at a mass of 125 GeV. The analysis searches for decays of the a1 (h1) states into pairs of τ leptons and covers a mass range for the a1 (h1) boson of 4 to 8 GeV. The search reveals no significant excess in data above standard model background expectations, and an upper limit is set on the signal production cross section times branching fraction as a function of the a1 (h1) boson mass. The 95% confidence level limit ranges from 4.5 pb at ma1ma1 {m}_{{\mathrm{a}}_1} (mh1)=8(mh1)=8 \left({m}_{{\mathrm{h}}_1}\right)=8 GeV to 10.3 pb at ma1ma1 {m}_{{\mathrm{a}}_1} (mh1)=5(mh1)=5 \left({m}_{{\mathrm{h}}_1}\right)=5 GeV.engThis article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.Journal articlehttps://doi.org/10.1007/JHEP01(2016)079