Non-Standard Models, Solar Neutrinos, and Large θ_{13}

Abstract

Solar neutrino experiments have yet to see directly the transition region between matter-enhanced and vacuum oscillations. The transition region is particularly sensitive to models of non-standard neutrino interactions and propagation. We examine several such non-standard models, which predict a lower-energy transition region and a flatter survival probability for the 8 B solar neutrinos than the standard large-mixing angle (LMA) model. We find that while some of the non-standard models provide a better fit to the solar neutrino data set, the large measured value of θ13 and the size of the experimental uncertainties lead to a low statistical significance for these fits. We have also examined whether simple changes to the solar density profile can lead to a flatter 8 B survival probability than the LMA prediction, but find that this is not the case for reasonable changes. We conclude that the data in this critical region is still too poor to determine whether any of these models, or LMA, is the best description of the data.

Solar neutrino physics with low-threshold dark matter detectors

“…While our 3+1 analysis focused on a model with a mass splitting ∆m 2 ∼ eV 2 relative to the other active neutrinos, it is important to recognize that our results are more broadly applicable to models with much different mass splittings. In the future it will be interesting to consider for example the impact of sterile neutrinos with smaller mass splitting than we have considered here [27] and also include the possibility of non-standard neutrino interactions [38,58]. Combining Solar neutrino data from a dark matter detector with present neutrino data sets should lead to more interesting constraints on these and other theories of extended neutrino sectors.…”

Determination of matter potential from global analysis of neutrino oscillation data

“…The evolution of the ensemble is then determined by the Hamiltonian H ν = H vac + H SM mat , with H SM mat = √ 2G F N e (r) diag(1, 0, 0). The magnitude and the presence of non-standard forms of the matter potential can be tested in solar neutrino experiments (and in combination with KamLAND) [14][15][16][17][18][19][20][21][22][23][24][25][26][27], as well and in the propagation of atmospheric and long-baseline neutrinos .…”

Combined Effect of NSI and SFP on Solar Electron Neutrino Oscillation

“…Here c ij = cosθ ij and s ij = sinθ ij and the δ is the CP-violating phase that we will ignore in our discussion [54].…”

“…The probe of non-standard neutrino interaction models is expected to observe in the transition region between 1 MeV and 4 MeV where the low energy solar neutrino experiments such as SNO+ will examine. Even though the data is poor in this region, the studies comparing the effects of non-standard models on the neutrino oscillation to the standard MSW-LMA oscillation shows that these effects modify the survival probability of neutrinos [50][51][52][53][54][55][56].…”