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

The large mixing (mass) (LMA) -MSW model of solar neutrinos (νe) 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 νe 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 νe flux φ(B) <φ(B: SSM). Pursuantly, a new “astroparticle” model with the relatively specific parameters ∆m2= 76 − 78μeV2(10−12 eV2); sin22θ = 0.58–0.56; φ(B) = 0.83– 0.81φ(8B:SSM) coupled with modest changes in the SSM, offers a viable solution consistent with data. Because KamLAND has set ∆m2 ∼ 50 × 106μeV2 , sin22θ ∼ 1 for antineutrinos, our model manifestly violates CPT invariance. The model predicts new distortional effects in solar neutrino spectra via νe-e scattering signals in the window 3–5 MeV, even though the spectrum is flat above 5 MeV. This window is accessible to experiment for the first time in KamLAND. New experiments are proposed to observe the more dramatic charged-current spectral effects.