Probing Exotic Fermions from a Seesaw/Radiative Model at the LHC

Abstract

There exist tree-level generalizations of the Type-I and Type-III seesaw mechanisms that realize neutrino mass via low-energy effective operators with d>5. However, these generalizations also give radiative masses that can dominate the seesaw masses in regions of parameter space --- i.e. they are not purely seesaw models, nor are they purely radiative models, but instead they are something in between. A recent work detailed the remaining minimal models of this type. Here we study the remaining model with d=9 and investigate the collider phenomenology of the exotic quadruplet fermions it predicts. These exotics can be pair produced at the LHC via electroweak interactions and their subsequent decays produce a host of multi-lepton signals. Furthermore, the branching fractions for events with distinct charged-leptons encode information about both the neutrino mass hierarchy and the leptonic mixing phases. In large regions of parameter-space discovery at the LHC with a 5 sigma significance is viable for masses approaching the TeV scale.

v3 supersedes JHEP version; corrects typo's and a basic error (erroneously placed matrix elements in Eq. 22)

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• Parton distributions for the LHC
• Distinguishing seesaw models at LHC with multi-lepton signals
• Minimal Flavour Seesaw Models
• Signatures for Majorana neutrinos at hadron colliders
• Resonant CP Violation due to Heavy Neutrinos at the LHC
• Neutrino masses and CDM in a non-supersymmetric model
• Enhancement of $h\to \gamma \gamma$ by seesaw-motivated exotic scalars
• Neutrino Masses from Loop-induced $d\ge 7$ Operators
• Unique Neutrino Mass Operator at any Mass Dimension
• Neutrino Mass Operators of Dimension up to Nine in Two-Higgs-doublet Model

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