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Gauge anomaly‐free constraints in neutrino seesaw models
Author(s) -
EmmanuelCosta D.
Publication year - 2010
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/prop.201000054
Subject(s) - seesaw molecular geometry , particle physics , physics , hypercharge , seesaw mechanism , anomaly (physics) , standard model (mathematical formulation) , gauge boson , context (archaeology) , neutrino , gauge symmetry , gauge (firearms) , gauge theory , fermion , quantum mechanics , archaeology , biology , history , paleontology
The implementation of seesaw mechanisms to give mass to neutrinos in the presence of an anomaly‐free U(1) X gauge symmetry is discussed in the context of minimal extensions of the standard model. It is shown that type‐I and type‐III seesaw mechanisms cannot be simultaneously implemented with an anomaly‐free local U(1) X , unless the symmetry is a replica of the well‐known hypercharge. For combined type‐I/II or type‐III/II seesaw models it is always possible to find nontrivial anomaly‐free charge assignments, which are however tightly constrained, if the new neutral gauge boson is kinematically accessible at LHC. The discovery of the latter and the measurement of its decays into third‐generation quarks, as well as its mixing with the standard Z boson, would allow one to discriminate among different seesaw realisations.