Implications of a modified Higgs to diphoton decay width

Marcela Carena*, Ian Low, Carlos E.M. Wagner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

190 Scopus citations


Motivated by recent results from Higgs searches at the Large Hadron Collider, we consider possibilities to enhance the diphoton decay width of the Higgs boson over the Standard Model expectation, without modifying either its production rate or the partial widths in the WW and ZZ channels. Studying effects of new charged scalars, fermions and vector bosons, we find that significant variations in the diphoton width may be possible if the new particles have light masses of the order of a few hundred GeV and sizeable couplings to the Higgs boson. Such couplings could arise naturally if there is large mass mixing between two charged particles that is induced by the Higgs vacuum expectation value. In addition, there is generically also a shift in the Zγ partial width, which in the case of new vector bosons tends to be of similar magnitude as the shift in the diphoton partial width, but smaller in other cases. Therefore simultaneous measurements in these two channels could reveal properties of new charged particles at the electroweak scale.

Original languageEnglish (US)
Article number60
JournalJournal of High Energy Physics
Issue number8
StatePublished - 2012


  • Beyond Standard Model
  • Higgs Physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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