Large gauge invariant non-standard neutrino interactions

By M. B. Gavela, D. Hernández, T. Ota, Walter Winter. 2008

134 citations recorded by the source corpus.

Theories beyond the standard model must necessarily respect its gauge symmetry. This implies strict constraints on the possible models of nonstandard neutrino interactions, which we analyze. The focus is set on the effective low-energy dimension six and eight operators involving four leptons, decomposing them according to all possible tree-level mediators, as a guide for model building. The new couplings are required to have sizable strength, while processes involving four charged leptons are required to be suppressed. For nonstandard interactions in matter, only diagonal tau-neutrino interactions can escape these requirements and can be allowed to result from dimension six operators. Large nonstandard neutrino interactions from dimension eight operators alone are phenomenologically allowed in all flavor channels and are shown to require at least two new mediator particles. The new couplings must obey general cancellation conditions both at the dimension six and dimension eight levels, which result from expressing the operators obtained from the mediator analysis in terms of a complete basis of operators. We illustrate with one example how to apply this information to model building.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/307043d6330f8c759a92d2b16fc31ffa412b0bc8

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

Citations in the corpus

Neutrino non-standard interactions: A status report (2019, background): “However, it has been noted [38] that models of this type are highly constrained from other low energy processes – such as non-unitarity of the PMNS matrix, electroweak oblique corrections, etc.”
Updated constraints on non-standard interactions from global analysis of oscillation data (2018, background): “Of course, for models with a high energy New Physics scale, electroweak gauge invariance generically implies that the NSI-NC parameters are still expected to be subject to tight constraints from charged lepton observables [16, 17], leading to no visible effect in oscillations.”
Constraints on flavor-diagonal non-standard neutrino interactions from Borexino Phase-II (2019, unknown): “In addition to the SM interactions presented above, many models of physics beyond the Standard Model (BSM) predict new interactions of the neutrinos with the other SM fermions [41–51].”
Global Analyses of Neutrino Oscillation Experiments (2015, background): “This constraints the new physics realizations of this scenario [89] and, generically, the size of the NSI couplings which can be generated.”