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LHC 750 GeV Diphoton excess in a radiative seesaw model

Authors
  • Kanemura, Shinya
  • Nishiwaki, Kenji
  • Okada, Hiroshi
  • Orikasa, Yuta
  • Park, Seong Chan
  • Watanabe, Ryoutaro
Type
Preprint
Publication Date
Dec 30, 2015
Submission Date
Dec 30, 2015
Identifiers
arXiv ID: 1512.09048
Source
arXiv
License
Unknown
External links

Abstract

We investigate a possibility for explaining the recently announced 750 GeV diphoton excess by the ATLAS and the CMS experiments at the CERN LHC in a model with multiple doubly-charged particles, which was originally suggested for explaining tiny neutrino masses through a three-loop effect in a natural way. The enhanced radiatively generated effective coupling of a new singlet scalar $S$ with diphoton, with multiple charged particles in the loop, enlarges the production rate of $S$ in $pp \to S+X$ via photon fusion process and also the decay width $\Gamma(S \to \gamma\gamma)$ even without assuming a tree level production mechanism. Very interestingly, we find that the branching ratio $\mathcal{B}(S \to \gamma\gamma)$ is $\simeq 60\%$ fixed by quantum numbers and the model is consistent with all the constraints from $8\,\text{TeV}$ LHC data.

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