Day-night asymmetry of high and low energy solar neutrino events in Super-Kamiokande and in the Sudbury Neutrino Observatory

Abstract

In the context of solar neutrino oscillations among active states, we briefly discuss the current likelihood of Mikheyev-Smirnov-Wolfenstein (MSW) solutions to the solar neutrino problem, which appear to be currently favored at large mixing, where small Earth regeneration effects might still be observable in Super-Kamiokande (SK) and in the Sudbury Neutrino Observatory (SNO). We point out that, since such effects are larger at high (low) solar neutrino energies for high (low) values of the mass square difference δm^2, it may be useful to split the night-day rate asymmetry in two separate energy ranges. We show that the difference Δof the night-day asymmetry at high and low energy may help to discriminate the two large-mixing solutions at low and high δm^2 through a sign test, both in SK and in SNO, provided that the sensitivity to Δcan reach the (sub)percent level.

6 pages (RevTeX) + 4 figures (PostScript). Final version, to appear in Phys. Rev. D

References in corpus (8)

• Three-flavor MSW solutions of the solar neutrino problem
• Quasivacuum solar neutrino oscillations
• What will the first year of SNO show?
• MSW Effects in Vacuum Oscillations
• Testing solar neutrino MSW oscillations at low delta m^2 through time variations of event rates in GNO and BOREXINO
• Day-Night and Energy Dependence of MSW Solar Neutrinos for Maximal Mixing
• Describing Analytically the Matter-Enhanced Two-Neutrino Transitions in a Medium
• On the Size of the Dark Side of the Solar Neutrino Parameter Space

Cited by in corpus (20)

• Majorana Neutrinos, Neutrino Mass Spectrum, CP-Violation and Neutrinoless Double Beta-Decay: I. The Three-Neutrino Mixing Case
• Constraints on neutrino oscillation parameters from the SNO salt phase data
• Frequentist analyses of solar neutrino data (updated including KamLAND and SNO data)
• Constraining Majorana neutrino electromagnetic properties from the LMA-MSW solution of the solar neutrino problem
• Majorana Neutrinos, Neutrino Mass Spectrum, CP-Violation and Neutrinoless Double Beta-Decay: II. Mixing of Four Neutrinos
• Global Analysis with SNO: Toward the Solution of the Solar Neutrino Problem
• Exploring Neutrino Oscillations with Superbeams
• Neutrinos from SN1987A, Earth matter effects and the LMA solution of the solar neutrino problem
• Leptogenesis and neutrino parameters
• Realization of the Large Mixing Angle Solar Neutrino Solution in an SO(10) Supersymmetric Grand Unified Model
• Large Mixing Angle MSW Solution in an SU(3)_LxU(1)_N Gauge Model with Two-loop Radiative Mechanism
• Zenith angle distributions at Super-Kamiokande and SNO and the solution of the solar neutrino problem
• Leptogenesis with SU(5)-inspired mass matrices
• Oscillation tomography of the Earth with solar neutrinos and future experiments
• The Earth effects on the supernova neutrino spectra
• Four-Neutrino Oscillations at SNO
• GUT Model Predictions for Neutrino Oscillation Parameters Compatible with the Large Mixing Angle Solar Solution
• Solar Neutrino Zenith Angle Distribution and Uncertainty in Earth Matter Density
• Four--Neutrino Oscillations at SNO
• Solar neutrino oscillations in the quasi-vacuum regime