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

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2016
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Abstract

A 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, (h_1) or (h_2), via gluon-gluon fusion and subsequent decay into a pair of the lightest Higgs bosons, (a_{1}) or (h_1). The (h_1) or(h_2) boson is identified with the observed state at a mass of 125 GeV. The analysis searches for decays of the (a_{1}) ((h_1)) states into pairs of τ leptons and covers a mass range for the a 1 (h 1 ) 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 a 1 ((h_1)) boson mass. The 95% confidence level limit ranges from 4.5 pb at (m_{a_1} (m_{h_1})) = 8 GeV to 10.3 pb at (m_{a_1} (m_{h_1})) = 5 GeV.

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High Energy Physics - Experiment, Supersymmetry, Hadron-Hadron scattering, Higgs physics
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Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Flechl, M., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., … Woods, N. (2016). 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 $ \sqrt{s}=8 $ TeV. In Journal of High Energy Physics (Vol. 2016, Issue 1). Springer Science and Business Media LLC. https://doi.org/10.1007/jhep01(2016)079