New vector bosons and the diphoton excess

Jorge de Blas; Jose Santiago; Roberto Vega-Morales

doi:10.1016/j.physletb.2016.05.078

paper

New vector bosons and the diphoton excess

arXiv:1512.07229 · doi:10.1016/j.physletb.2016.05.078

Abstract

We consider the possibility that the recently observed diphoton excess at $\sim 750$ GeV can be explained by the decay of a scalar particle ( $φ$ ) 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 $W^{'}$ 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 $φ$ and $W^{'}$ . On the other hand if $W^{'}$ does not carry color, we show that, provided additional colored particles exist to generate the required $φ$ to gluon coupling, the diphoton excess could be explained by the same $W^{'}$ commonly invoked to explain the diboson excess at $\sim 2$ TeV. We also explore possible connections between the diphoton and diboson excesses with the anomalous $t t ˉ$ forward-backward asymmetry.

Latex 8 pages, 1 figure. Extended discussion, new references. Matches published version

New vector bosons and the diphoton excess

Abstract

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