paper

The 750 GeV -cion: Where else should we look for it?

arXiv:1512.06091 · doi:10.1016/j.physletb.2016.03.052

Abstract

The resonance at GeV in the diphoton channel observed by ATLAS and CMS, if it holds up, is almost certainly the ()cion of a larger dynasty in a UV completion that may very well be connected to the hierarchy problem. At this stage, however, an effective field theory framework provides a useful way to parametrize searches for this resonance in other channels. Assuming that the excess is due to a new scalar or pseudoscalar boson, we study associated production of ("-strahlung") at the LHC and propose searches in several clean channels like , $γγ\ell\eslash$ and $\ell\ell\ellγ\eslash$ to probe dimension-5 operators coupling to Standard Model gauge bosons. We consider a range of widths for , from 5 GeV to 45 GeV, and find that the three channels probe complementary regions of parameter space and the suppression scale . The finding of most immediate relevance is that with 3 fb, the LHC might already reveal new excesses in the channel and a 5(3) discovery may already be possible after collecting 65(25) fb of data with $\ell\ell\ellγ\eslash$ events if the scale of the new physics is within 9 TeV for couplings respecting 8 TeV LHC bounds and compatible with the observed excess in diphotons for a wide resonance as suggested by the ATLAS Collaboration. Beyond the EFT parametrization, we found realizations of models with heavy vector-like quarks and leptons which can simultaneously fit the diphoton excess and be discovered in the channels proposed here.

11 pages, 2 tables, 5 figures. References and comments added. Version accepted for publication in Physics Letters B

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