New vector bosons and the diphoton excess

Understand

We consider the possibility that the recently observed diphoton excess at $\sim 750$ GeV can be explained by the decay of a scalar particle ($\varphi$) to photons.

• If the scalar is the remnant of a symmetry-breaking sector of some new gauge symmetry, its coupling to photons can be generated by loops of the charged massive vectors of the broken symmetry.
• If these new $W^\prime$ vector bosons carry color, they can also generate an effective coupling to gluons.
• In this case the diphoton excess could be entirely explained in a simplified model containing just $\varphi$ and $W^\prime$.