Probing CP violation in h →zγ with background interference

Marco Farina, Yuval Grossman, Dean J. Robinson

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We show that the parity of the hZγ vertex can be probed by interference between the gluon fusion Higgs production, gg→h→γZ→γ+-, and the background, gg→γZ→γ+-, amplitudes. In the presence of a parity violating hZγ vertex, this interference alters the kinematic distribution of the leptons and photon compared to Standard Model (SM) expectations. For a Higgs with SM-sized width and couplings, we find that the size of the effect enters at most at the 10-2 level. Such a small effect cannot be seen at the LHC, even with futuristic high luminosities. Should there exist other broader scalar particles with larger production cross-section times branching ratio to Zγ, then the parity structure of their Zγ couplings can be probed with this technique.

Original languageEnglish
Article number073007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
StatePublished - 7 Oct 2015
Externally publishedYes

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© 2015 American Physical Society.


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