Abstract
We investigate signatures induced by a very light pseudoscalar Higgs in neutralino decays in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) and determine their observability at the LHC. We concentrate on scenarios which feature two light scalar Higgs bosons (one of them is SM-like with a mass of 125 GeV and a singlet-like lighter one) with a very light (singlet-like) pseudoscalar Higgs in the mass range 2m τ < \( {m_{{a_1^0}}} \) < 2m b . We consider neutralino-chargino pair production and the subsequent decay \( \widetilde{\chi}_{2,3}^0\to\ \widetilde{\chi}_1^0a_1^0 \), which leads to topologies involving multi-leptons and missing transverse energy. We determine a set of selection cuts that can effectively isolate the signal from backgrounds of the Standard Model or the Minimal Supersymmetric Standard Model. We also exemplify the procedure with a set of benchmark points, for which we compute the expected number of events and signal strength for LHC with 8 TeV center of mass energy. We show that this signal can already be probed for some points in the NMSSM parameter space.
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Cerdeño, D.G., Ghosh, P., Park, C.B. et al. Collider signatures of a light NMSSM pseudoscalar in neutralino decays in the light of LHC results. J. High Energ. Phys. 2014, 48 (2014). https://doi.org/10.1007/JHEP02(2014)048
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DOI: https://doi.org/10.1007/JHEP02(2014)048