Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-05-06
Phys.Rev. D67 (2003) 013006
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1103/PhysRevD.67.013006
An updated analysis of all available neutrino oscillation evidence in Solar experiments (SK day and night spectra, global rates from Homestake, SAGE and GALLEX) including the latest SNO CC and NC data is presented. Assuming that the shape of the SNO CC energy spectrum is undistorted and using the information provided by SNO we obtain, for the fraction of electron neutrinos remaining in the solar beam at energies $\gsim 5$ MeV: $\phi_{CC}/\phi_{NC}=0.34^{+0.05}_{-0.04},$ which is nominally $\sim 30\sigma$ away from the standard value. The fraction of oscillating neutrinos which into active ones is computed to be: $ (\Phi_{NC}-\Phi_{CC})/(\Phi_{SSM}-\Phi_{CC})=0.92^{+0.39}_{-0.20} $ nearly $5\sigma$ deviations from the pure sterile oscillation case. The data is still compatible with an important fraction of sterile component in the solar beam (up to 20% of the total). In the framework of two active neutrino oscillations we determine individual neutrino mixing parameters and their errors in the region of no spectrum distortion ($\Delta< T_e> <1%$), we obtain $\Delta m^2= 4.5^{+2.7}_{-1.4}\times 10^{-5} \eV^2, \quad \tan^2\theta=0.40^{+0.10}_{-0.08}. $ This is in agreement with the best $chi^2$ solution in the LMA region.
Aliani P.
Antonelli Vito
Ferrari Ruggero
Picariello Marco
Torrente-Lujan Emilio
No associations
LandOfFree
Determination of Neutrino mixing parameters after SNO oscillation evidence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Determination of Neutrino mixing parameters after SNO oscillation evidence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determination of Neutrino mixing parameters after SNO oscillation evidence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-497225