Bounding the Dimension-5 Seesaw Portal with non-pointing photon searches

L. Duarte, J. Jones-Pérez, C. Manrique-Chavil

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The addition of d = 5 operators to the Seesaw model leads to the Dimension-5 Seesaw Portal. Here, two new operators provide interactions for the heavy sterile neutrinos. In particular, the Higgs boson can have a large branching ratio into two heavy neutrinos, meaning that these states can be searched for at the LHC. Moreover, the heavy neutrinos can now decay dominantly into light neutrinos and photons. If the heavy neutrinos are long-lived, then searches for delayed, non-pointing photons can constrain the model. In this work, we carry out a detailed recast of an ATLAS search for such displaced photons, triggered by a charged lepton produced in association to the Higgs, placing bounds on the branching ratio for Higgs decay into two heavy neutrinos as low as 2%.

Original languageEnglish
Article number133
JournalJournal of High Energy Physics
Issue number4
StatePublished - Apr 2024


  • Specific BSM Phenomenology
  • Sterile or Heavy Neutrinos


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