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Diphotons from tetraphotons in the decay of a 125 GeV Higgs boson at the LHC

Patrick Draper1,* and David McKeen2,†

  • 1Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064, USA
  • 2Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada

  • *pidraper@ucsc.edu
  • †mckeen@uvic.ca
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Phys. Rev. D 85, 115023 – Published 26 June, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.115023

Abstract

Recently the ATLAS and CMS experiments have presented data hinting at the presence of a Higgs boson at mh≃125  GeV. The best-fit h→γγ rate averaged over the two experiments is approximately 2.1±0.5 times the standard model prediction. We study the possibility that the excess relative to the standard model is due to h→aa decays, where a is a light pseudoscalar that decays predominantly into γγ. Although this process yields 4γ final states, if the pseudoscalar has a mass of the order tens of MeV, the two photons from each a decay can be so highly collimated that they may be identified as a single photon. Some fraction of the events then contribute to an effective h→γγ signal. We study the constraints on the parameter space where the net h→γγ rate is enhanced over the standard model by this mechanism and describe some simple models that give rise to the pseudoscalar-photon interaction. Further tests and prospects for searches in the near future are discussed.

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Phys. Rev. D 85, 115023– Published 26 June, 2012
  • Received 4 May 2012
Article part of CHORUS

© 2012 American Physical Society

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