A 750 GeV diphoton signal from a very light pseudoscalar in the NMSSM

  • Ulrich Ellwanger
  • Cyril Hugonie
Open Access
Regular Article - Theoretical Physics


The excess of events in the diphoton final state near 750 GeV observed by ATLAS and CMS can be explained within the NMSSM near the R-symmetry limit. Both scalars beyond the Standard Model Higgs boson have masses near 750 GeV, mix strongly, and share sizeable production cross sections in association with b-quarks as well as branching fractions into a pair of very light pseudoscalars. Pseudoscalars with a mass of ∼ 210 MeV decay into collimated diphotons, whereas pseudoscalars with a mass of ∼ 500–550 MeV can decay either into collimated diphotons or into three π 0 resulting in collimated photon jets. Various such scenarios are discussed; the dominant constraints on the latter scenario originate from bounds on radiative Y decays, but they allow for a signal cross section up to 6.7 fb times the acceptance for collimated multiphotons to pass as a single photon.


Supersymmetry Phenomenology 


Open Access

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Copyright information

© The Author(s) 2016

Authors and Affiliations

  1. 1.Laboratoire de Physique Théorique, UMR 8627, CNRS, Université de Paris-Sud, Univ. Paris-SaclayOrsayFrance
  2. 2.School of Physics and AstronomyUniversity of SouthamptonSouthamptonU.K.
  3. 3.LUPM, UMR 5299, CNRS, Université de MontpellierMontpellierFrance

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