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arXiv · 1512.09048

LHC 750 GeV Diphoton excess in a radiative seesaw model

Shinya Kanemura·Kenji Nishiwaki·Hiroshi Okada·Yuta Orikasa·Seong Chan Park·Ryoutaro Watanabe
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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 $Γ(S\to γγ)$ even without assuming a tree level production mechanism. We provide detailed analysis on the cases with or without allowing the mixing between $S$ and the standard model Higgs doublet.

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Shinya Kanemura, Kenji Nishiwaki, Hiroshi Okada, Yuta Orikasa, Seong Chan Park, Ryoutaro Watanabe. 2016-10-16. LHC 750 GeV Diphoton excess in a radiative seesaw model. https://doi.org/10.1093/ptep%2Fptw164

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