Diphotons from electroweak triplet-singlet mixing

Kiel Howe, Simon Knapen, and Dean J. Robinson
Phys. Rev. D 94, 035021 – Published 23 August 2016

Abstract

The neutral component of a real pseudoscalar electroweak (EW) triplet can produce a diphoton excess at 750 GeV, if it is somewhat mixed with an EW singlet pseudoscalar. This triplet-singlet mixing allows for greater freedom in the diboson branching ratios than the singlet-only case, but it is still possible to probe the parameter space extensively with 300fb1. The charged component of the triplet is pair produced at the LHC, which results in a striking signal in the form of a pair of Wγ resonances with an irreducible rate of 0.27 fb. Other signatures include multiboson final states from cascade decays of the triplet-singlet neutral states. A large class of composite models feature both EW singlet and triplet pseudo-Nambu-Goldstone bosons in their spectrum, with the diboson couplings generated by axial anomalies.

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  • Received 11 May 2016

DOI:https://doi.org/10.1103/PhysRevD.94.035021

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Kiel Howe1, Simon Knapen2,3,4, and Dean J. Robinson2,3,4

  • 1Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
  • 2Department of Physics, University of California, Berkeley, California 94720, USA
  • 3Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
  • 4Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583, Japan

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Issue

Vol. 94, Iss. 3 — 1 August 2016

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