On-shell interference effects in Higgs boson final states

Christoph Englert, Ian Low, Michael Spannowsky

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Top quark loops in Higgs production via gluon fusion at large invariant final state masses can induce important interference effects in searches for additional Higgs bosons as predicted in, e.g., Higgs portal scenarios and the minimal supersymmetric Standard Model when the heavy scalar is broad or the final state resolution is poor. Currently, the limit setting as performed by both ATLAS and CMS is based on injecting a heavy Higgs-like signal neglecting interference effects. In this paper, we perform a study of such "on-shell" interference effects in pp→ZZ and find that they lead to a O(30%) width scheme-dependent modification of the signal strength. Including the continuum contributions to obtain, e.g., the full pp→ZZ→4 final state, this modification is reduced to the 10% level in the considered intermediate mass range.

Original languageEnglish (US)
Article number074029
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
StatePublished - Apr 29 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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