2015/12/28 by Haipeng An, Clifford Cheung, An, Haipeng +3 · 3 citations
Physics and Astronomy · #Particle physics theoretical and experimental studies #Particle Detector Development and Performance #Dark Matter and Cosmic Phenomena
paper · pdf · doi:10.48550/arxiv.1512.08378
ATLAS and CMS have each reported a modest diphoton excess consistent with the decay of a broad resonance at ~ 750 GeV. We show how this signal can arise in a weakly coupled theory comprised solely of narrow width particles. In particular, if the decaying particle is produced off-shell, then the associated diphoton resonance will have a broad, adjustable width. We present simplified models which explain the diphoton excess through the three-body decay of a scalar or fermion. Our minimal ultraviolet completion is a weakly coupled and renormalizable theory of a singlet scalar plus a heavy vector-like quark and lepton. The smoking gun of this mechanism is an asymmetric diphoton peak recoiling against missing transverse energy, jets, or leptons.