Global analyses of neutrino oscillation experiments

M.C Gonzalez-Garcia,Michele Maltoni,Thomas Schwetz

doi:10.1016/j.nuclphysb.2016.02.033

M.C Gonzalez-Garcia, Michele Maltoni + Show 1 more

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https://doi.org/10.1016/j.nuclphysb.2016.02.033

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Abstract

We summarize the determination of some neutrino properties from the global analysis of solar, atmospheric, reactor, and accelerator neutrino data in the framework of three-neutrino mixing as well as in some extended scenarios such as the mixing with eV-scale sterile neutrinos invoked for the interpretation of the short baseline anomalies, and the presence of non-standard neutrino interactions.

Highlights

Thanks to remarkable discoveries by a number of neutrino oscillation experiments it is an established fact that neutrinos have mass and leptonic flavors are not symmetries of Nature [1,2]
We find that the global 3 + 1 fit leads to χm2 in/dof = 712/680 with a p-value 19%, whereas the so-called parameter goodness of fit (PG) test [75] indicates that appearance and disappearance data are consistent with each other only with a p-value of about 10−4
Comparing the results in Fig. 7 with the bounds on nonstandard interactions (NSI) derived in Refs. [87,88] from nonoscillation data we find that, with the possible exception of εeuμ,d, the global oscillation analysis presented here yields the most restrictive bounds on the vector NSI parameters, in particular those involving τ flavor

Summary

Introduction: the new minimal standard model

Thanks to remarkable discoveries by a number of neutrino oscillation experiments it is an established fact that neutrinos have mass and leptonic flavors are not symmetries of Nature [1,2]. At present we have observed neutrino oscillation effects in: These results imply that neutrinos are massive and there is physics beyond the Standard Model (SM). After spontaneous electroweak symmetry breaking we have: LD = LSM − Mν νLνR + h.c. After spontaneous electroweak symmetry breaking we have: LD = LSM − Mν νLνR + h.c In this case mass eigenstate neutrinos are Dirac fermions, i.e., νc = ν; to construct a mass term only with the SM left-handed neutrinos by allowing L violation: LM. Note that the Majorana mass term above breaks the electroweak gauge invariance, and spoils the renormalizability of the model In this respect LM can only be understood as a low energy limit of a complete theory, whereas LD is formally self-consistent.

Analysis in the framework of three-neutrino mixing

Absolute neutrino mass measurements

Sterile neutrinos at the eV scale

Matter potential: non-standard interactions

Conclusions and outlook