Interpretation of 750 GeV Diphoton Excess at LHC in Singlet Extension of   Color-octet Neutrino Mass Model
  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. 
Ran Ding (Peking Univ.), Zhi-Long Han (Nankai Univ.), Yi Liao   (ITP-CAS, Peking Univ, Nankai Univ.), Xiao-Dong Ma (Nankai U...
hep-ph