paper

LHC diphotons from electroweakly pair-produced composite pseudoscalars

arXiv:1512.06827

Abstract

Motivated by excess diphoton events reported by ATLAS and CMS, we show that composite pseudoscalars, bound states of heavy fermions under a new confining gauge theory, can be pair-produced by Drell-Yan production if the constituent particles are electrically charged. The decays of these pion-like bound states into two photons can explain the observed events near 750 GeV. The model predicts that there should be significant numbers of 4-photon events from decays of the pseudoscalar pairs, as well as same-sign dilepton pairs at a somewhat lower invariant mass, or multijet signals, coming from decays of charge-2 pseudoscalars. These states and their decays are necessary for avoiding stable charged baryon-like relics in the new confining sector. A neutral baryon-like dark matter candidate of mass GeV is a further prediction of the model, for SU() confining gauge group.

4 pages, 2 figures; v2: added figure and changed operator in eq. (13). Paper withdrawn because resonant production of heavy vector meson always dominates over the considered mechanism

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