Models of LHC Diphoton Excesses Valid up to the Planck scale

Understand

We discuss a possibility to explain the LHC diphoton excesses at $750$GeV by the new scalar $X$ that couples to the gauge bosons through the loop of new massive particles with Standard Model charges.

• We assume that the new particles decay into the Standard Model particles at the tree level.
• We systematically examine the models that preserve the vacuum stability and the perturbativity up to the Planck scale.
• When we take scalars for the new particles, we find that only a few diquark and dilepton models can explain the observed diphoton cross section without conflicting the experimental mass bounds.