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Broad Diphotons from Narrow States

An, Haipeng and Cheung, Clifford and Zhang, Yue (2015) Broad Diphotons from Narrow States. . (Submitted)

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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.

Item Type:Report or Paper (Discussion Paper)
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Additional Information:Submitted on 28 Dec 2015. H.A. is supported by the Walter Burke Institute at Caltech and by DOE Grant No. DESC0011632. C.C. is supported by a DOE Early Career Award under Grant No. DE-SC0010255 and a Sloan Research Fellowship. Y.Z. is supported by the Gordon and Betty Moore Foundation through Grant #776 to the Caltech Moore Center for Theoretical Cosmology and Physics, and by the DOE Grant Nos. DE-FG02-92ER40701 and DE-SC0010255.
Group:Walter Burke Institute for Theoretical Physics, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Department of Energy (DOE)DESC0011632
Department of Energy (DOE)DE-SC0010255
Gordon and Betty Moore Foundation776
Department of Energy (DOE)DE-FG02- 92ER40701
Department of Energy (DOE)DE-SC0010255
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
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Record Number:CaltechAUTHORS:20160113-132530546
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63647
Deposited By: Joy Painter
Deposited On:13 Jan 2016 21:33
Last Modified:02 Jun 2023 00:24

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