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- W3156957786 abstract "Nonzero neutrino masses imply the existence of degrees of freedom and interactions beyond those in the Standard Model. A powerful indicator of what these might be is the nature of the massive neutrinos: Dirac fermions versus Majorana fermions. While addressing the nature of neutrinos is often associated with searches for lepton-number violation, there are several other features that distinguish Majorana from Dirac fermions. Here, we compute in great detail the kinematics of the daughters of the decays into charged-leptons and neutrinos of hypothetical heavy neutral leptons at rest. We allow for the decay to be mediated by the most general four-fermion interaction Lagrangian. We demonstrate, for example, that when the daughter charged-leptons have the same flavor or the detector is insensitive to their charges, polarized Majorana-fermion decays have zero forward-backward asymmetry in the direction of the outgoing neutrino (relative to the parent spin), whereas Dirac-fermion decays can have large asymmetries. Going beyond studying forward-backward asymmetries, we also explore the fully differential width of the three-body decays. It contains a wealth of information not only about the nature of the new fermions but also the nature of the interactions behind their decays." @default.
- W3156957786 created "2021-04-26" @default.
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- W3156957786 date "2021-07-30" @default.
- W3156957786 modified "2023-10-16" @default.
- W3156957786 title "Three-body decays of heavy Dirac and Majorana fermions" @default.
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- W3156957786 doi "https://doi.org/10.1103/physrevd.104.015038" @default.
- W3156957786 hasPublicationYear "2021" @default.
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