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

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.Comment: 25pages, 7 Fig and 4 Tables; Final JCAP Published version (text improved, reference, footnotes added

Physics at a future neutrino factory and super-beam facility

The conclusions of the Physics Working Group of the International Scoping Study of a future Neutrino Factory and super-beam facility (the ISS) are presented. The ISS was carried out by the international community between NuFact05, (the 7th International Workshop on Neutrino Factories and Super-beams, Laboratori Nazionali di Frascati, Rome, 21-26 June 2005) and NuFact06 (Ivine, CA, 24-30 August 2006). The physics case for an extensive experimental programme to understand the properties of the neutrino is presented and the role of high-precision measurements of neutrino oscillations within this programme is discussed in detail. The performance of second-generation super-beam experiments, beta-beam facilities and the Neutrino Factory are evaluated and a quantitative comparison of the discovery potential of the three classes of facility is presented. High-precision studies of the properties of the muon are complementary to the study of neutrino oscillations. The Neutrino Factory has the potential to provide extremely intense muon beams and the physics potential of such beams is discussed in the final section of the report