Broad Diphotons from Narrow States
Abstract
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.
Cite
@article{arxiv.1512.08378,
title = {Broad Diphotons from Narrow States},
author = {Haipeng An and Clifford Cheung and Yue Zhang},
journal= {arXiv preprint arXiv:1512.08378},
year = {2015}
}
Comments
7 pages, 6 figures