Abstract
We propose that the possible 750 GeV diphoton excess can be explained in the color-octet neutrino mass model extended with a scalar singlet $\Phi$. The model generally contains $N_s$ species of color-octet, electroweak doublet scalars $S$ and $N_f$ species of color-octet, electroweak triplet $\chi$ or singlet $\rho$ fermions. While both scalars and fermions contribute to the production of $\Phi$ through gluon fusion, only the charged members induce the diphoton decay of $\Phi$. The diphoton rate can be significantly enhanced due to interference between the scalar and fermion loops. We show that the diphoton cross section can be from 3 to 10 fb for O(TeV) color-octet particles while evading all current LHC limits.
Highlights
Both ATLAS and CMS have found an excess in the diphoton channel around 750 GeV with √
We propose that the possible 750 GeV diphoton excess can be explained in the color-octet neutrino mass model extended with a scalar singlet Φ
We show that the diphoton cross section can be from 3 to 10 fb for O(TeV) color-octet particles while evading all current LHC limits
Summary
Both ATLAS and CMS have found an excess in the diphoton channel around 750 GeV with √. Since the cross section for the excess is large for such a heavy resonance, it seems natural that the resonance is produced and decays through interactions with some new particles that participate in strong and electromagnetic interactions In this context the color-octet model of neutrino mass [11] stands out, in which the octet particles generating radiative neutrino mass would couple to the resonance field resulting in its strong production and electromagnetic decay. Since the nature of the resonance, named Φ below, such as parity and spin is completely unknown, we treat it in the simplest manner from the point of view of effective field theory Assuming it is an electroweak singlet of spin zero, its relevant effective interaction with color-octet scalars is.
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