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

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

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Resumen

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%.

Idioma originalInglés
Número de artículo133
PublicaciónJournal of High Energy Physics
Volumen2024
N.º4
DOI
EstadoPublicada - abr. 2024

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