SNO and the solar neutrino problem

Abstract

We study the implication of the first neutral current (NC) data from SNO. We perform model independent and model dependent analyses of the solar neutrino data. The inclusion of the first SNO NC data in the model independent analysis determines the allowed ranges of ${}^{8}B$ flux normalization and the ${\nu }_e$ survival probability more precisely than what was possible from the SK and SNO CC combination. Transitions to pure sterile states are seen to be hugely disfavored however transition to ``mixed'' states are still viable with a probability of finding about 30% sterile component in the resultant beam at $1\sigma$. We perform global ${\nu }_e-{\nu }_{active}$ oscillation analyses of solar neutrino data including the recent SNO results. LMA emerges as a huge favorite while LOW appears at the $3\sigma$ level. All the other solutions are disfavored at $3\sigma$ while SMA is virtually ruled out. Maximal mixing is disfavored at $3\sigma$. We explore in some details the reasons for the incompatibility of the maximal mixing solution and the LOW solution with the global solar neutrino data.

Talk given at Conference on Physics Beyond the Standard Model: Beyond the Desert 02, Oulu, Finland, 2-7 Jun 2002

References in corpus (13)

• Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory
• Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters
• Getting the most from the statistical analysis of solar neutrino oscillations
• Before and After: How has the SNO NC measurement changed things?
• Ruling out four-neutrino oscillation interpretations of the LSND anomaly?
• Constraining neutrino oscillation parameters with current solar and atmospheric data
• Unknowns after the SNO Charged-Current Measurement
• Solar neutrinos: global analysis with day and night spectra from SNO
• If sterile neutrinos exist, how can one determine the total solar neutrino fluxes?
• Three Generation Neutrino Oscillation Parameters after SNO
• Solar Neutrino Rates, Spectrum, and its Moments : an MSW Analysis in the Light of Super-Kamiokande Results
• Energy Independent Solution to the Solar Neutrino Anomaly including the SNO data
• Global oscillation analysis of solar neutrino data with helioseismically constrained fluxes

Cited by in corpus (7)

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• High Precision Measurements of ${\theta }_{\odot }$ in Solar and Reactor Neutrino Experiments
• Reactor Anti-Neutrino Oscillations and Gadolinium Loaded Super-Kamiokande Detector
• Neutrino Oscillation Parameters After High Statistics KamLAND Results
• Testing the solar LMA region with KamLAND data
• Solar Neutrino Oscillation Phenomenology
• Neutrinos from Supernovae