Digamma, what next?

  • Roberto Franceschini
  • Gian F. Giudice
  • Jernej F. Kamenik
  • Matthew McCullough
  • Francesco Riva
  • Alessandro Strumia
  • Riccardo TorreEmail author
Open Access
Regular Article - Theoretical Physics


If the 750 GeV resonance in the diphoton channel is confirmed, what are the measurements necessary to infer the properties of the new particle and understand its nature? We address this question in the framework of a single new scalar particle, called digamma (Ϝ). We describe it by an effective field theory, which allows us to obtain general and model-independent results, and to identify the most useful observables, whose relevance will remain also in model-by-model analyses. We derive full expressions for the leading-order processes and compute rates for higher-order decays, digamma production in association with jets, gauge or Higgs bosons, and digamma pair production. We illustrate how measurements of these higher-order processes can be used to extract couplings, quantum numbers, and properties of the new particle.


Phenomenological Models 


Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.


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Copyright information

© The Author(s) 2016

Authors and Affiliations

  • Roberto Franceschini
    • 1
  • Gian F. Giudice
    • 1
  • Jernej F. Kamenik
    • 1
    • 2
    • 3
  • Matthew McCullough
    • 1
  • Francesco Riva
    • 1
  • Alessandro Strumia
    • 1
    • 4
  • Riccardo Torre
    • 5
    Email author
  1. 1.CERN, Theoretical Physics DepartmentGenevaSwitzerland
  2. 2.Jožef Stefan InstituteLjubljanaSlovenia
  3. 3.Faculty of Mathematics and PhysicsUniversity of LjubljanaLjubljanaSlovenia
  4. 4.Dipartimento di Fisica dell’Università di Pisa and INFNPisaItaly
  5. 5.Institut de Théorie des Phénomènes Physiques, EPFLLausanneSwitzerland

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