A New Model of Solar Neutrinos in Manifest Violation of CPT Invariance

Abstract

The large mixing (mass)(LMA)-MSW model of solar neutrinos (nue) is now widely held to be near definitive, based on global consistency with data. No physical effect, however, compels its uniqueness. The present search for an explicitly testable competitive model was stimulated by a surprising finding--the high energy part of the standard solar model (SSM) 8B nue spectrum can be scaled very precisely to observed flux levels without measurable shape distortion via sensitive combinations of long wavelength flavor conversion in vacuum and a 8B flux f(B)<f(B:SSM).Pursuantly, a new "astroparticle" model with the relatively specific parameters deltam2 = 76-78 mueV2 (10-12 eV2); sin2 2theta = 0.59-0.55; f(B) =0.8f(B:SSM) coupled with modest changes in the SSM, offers a viable solution consistent with data. Because KamLAND has set deltam2~50x106 mueV2, sin2 2theta~1 for antineutrinos, our model manifestly violates CPT invariance. The model predicts new distortional effects in solar neutrino spectra via nu-e scattering signals in the window 3-5MeV, even though the spectrum is flat above 5 MeV. in This window that is accessible to experiment for the first time in KamLAND. New experiments are proposed to observe the more dramatic charged-current spectral effects.