Can lepton flavor violating interactions explain the atmospheric neutrino problem?

Details Can lepton flavor violating interactions explain the atmospheric neutrino problem? Can lepton flavor violating interactions explain the atmospheric neutrino problem?

1999-09-15

arxiv.org/abs/hep-ph/9909390v1

Phys.Rev. D61 (2000) 053005

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, no figures, Latex

Scientific paper

10.1103/PhysRevD.61.053005

We investigate whether flavor changing neutrino interactions (FCNIs) can be sufficiently large to provide a viable solution to the atmospheric neutrino problem. Effective operators induced by heavy boson exchange that allow for flavor changing neutrino scattering off quarks or electrons are related by an $SU(2)_L$ rotation to operators that induce anomalous tau decays. Since $SU(2)_L$ violation is small for New Physics at or above the weak scale, one can use the upper bounds on lepton flavor violating tau decays or on lepton universality violation to put severe, model-independent bounds on the relevant non-standard neutrino interactions. Also $Z$-induced flavor changing neutral currents, due to heavy singlet neutrinos, are too small to be relevant for the atmospheric neutrino anomaly. We conclude that the FCNI solution to the atmospheric neutrino problem is ruled out.

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