2003/09/15 by P. Aliani, Aliani, P., V. Antonelli +7 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0309156
arxiv created 2003/09/15 · openalex publication_date 2003/09/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
An updated analysis of all available neutrino oscillation evidence in Solar experiments including the latest SNO ES,CC and NC data (254d live time, NaCL enhanced efficiency) is presented. We obtain, for the fraction of active oscillating neutrinos: sin2alpha=(ΦNC-ΦCC)/(ΦSSM-ΦCC)=0.94+0.0.065-0.060 nearly 20σfrom the pure sterile oscillation case. The fraction of oscillating sterile neutrinos cos2α\lsim 0.12 (1 sigma CL). At face value, these results might slightly favour the existence of a small sterile oscillating sector. In the framework of two active neutrino oscillations we determine individual neutrino mixing parameters and their errors we obtain Delta m2= 7.01± 0.08 × 10-5 eV2, tan2 theta=0.42+0.12-0.07. The main difference with previous analysis is a better resolution in parameter space. In particular the secondary region at larger mass differences (LMAII) is now excluded at 95% CL. The combined analysis of solar and Kamland data concludes that maximal mixing is not favoured at 4-5 sigma. This is not supported by the antineutrino reactor results alone. We estimate the individual elements of the two neutrino mass matrix, writing M2=m2 I+M02, we obtain (1 sigma errors): M02=10-5 eV2\pmatrix 2.06+0.29-0.31 & 3.15+0.29-0.35 \cr 3.15+0.29-0.35 & 4.60+0.56-0.44 .