Hint of non-standard dynamics in solar neutrino conversion

Abstract

Motivated by the recent low-threshold measurements of the solar 8B neutrino spectrum performed by Borexino, Super-Kamiokande and the Sudbury Neutrino Observatory -- all now monitoring the transition regime between low-energy (vacuum-like) and high-energy (matter-dominated) flavor conversions -- we consider the role of sub-dominant dynamical terms induced by new flavor-changing interactions. We find that the presence of such perturbations with strength ~ 0.1 G_F is now favored, offering a better description of the anomalous behavior suggested by the new results, whose spectrum shows no sign of the typical low-energy upturn predicted by the standard MSW mechanism. Our findings, if interpreted in a 2-flavor scheme, provide a hint of such new interactions at the ~ 2 sigma level, which is rather robust with respect to 3-flavor effects possibly induced by non-zero theta_13.

arXiv comment5 pages, 4 figures; one figure added; minor changes in the text; references added; matches version published in PRD (Rapid Communications)

References in corpus (34)

• Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory
• First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance
• Measurement of the rate of nu_e + d --> p + p + e^- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
• Measurement of Neutrino Oscillation with KamLAND: Evidence of Spectral Distortion
• Solar 8B and hep Neutrino Measurements from 1258 Days of Super-Kamiokande Data
• Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters
• Precision Measurement of Neutrino Oscillation Parameters with KamLAND
• Measurement of the Total Active 8B Solar Neutrino Flux at the Sudbury Neutrino Observatory with Enhanced Neutral Current Sensitivity
• Phenomenology with Massive Neutrinos
• Determination of Solar Neutrino Oscillation Parameters using 1496 Days of Super-Kamiokande-I Data
• Constraints on Neutrino Oscillations Using 1258 Days of Super-Kamiokande Solar Neutrino Data
• Electron Energy Spectra, Fluxes, and Day-Night Asymmetries of ${}^8$B Solar Neutrinos from the 391-Day Salt Phase SNO Data Set
• Solar neutrino measurements in Super-Kamiokande-I
• Measurement of the Solar Neutrino Capture Rate by the Russian-American Gallium Solar Neutrino Experiment During One Half of the 22-Year Cycle of Solar Activity
• Complete results for five years of GNO solar neutrino observations
• New results on solar neutrino fluxes from 192 days of Borexino data
• Present and Future Bounds on Non-Standard Neutrino Interactions
• Independent Measurement of the Total Active 8B Solar Neutrino Flux Using an Array of 3He Proportional Counters at the Sudbury Neutrino Observatory
• Constraints on ${\theta }_{13}$ from A Three-Flavor Oscillation Analysis of Reactor Antineutrinos at KamLAND
• Measurement of the solar 8B neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector
• Hints of theta_13>0 from global neutrino data analysis
• General bounds on non-standard neutrino interactions
• Low Energy Threshold Analysis of the Phase I and Phase II Data Sets of the Sudbury Neutrino Observatory
• Solar neutrinos as probes of neutrino-matter interactions
• Observables sensitive to absolute neutrino masses. II
• Probing neutrino non-standard interactions with atmospheric neutrino data
• Measurement of the ${\nu }_e$ and Total ${}^8$B Solar Neutrino Fluxes with the Sudbury Neutrino Observatory Phase I Data Set
• Homestake result, sterile neutrinos and low energy solar neutrino experiments
• Constraining nonstandard neutrino-quark interactions with solar, reactor and accelerator data
• Status of a hybrid three-neutrino interpretation of neutrino data
• Interpretation of MINOS data in terms of non-standard neutrino interactions
• Contrasting solar and reactor neutrinos with a non-zero value of theta13
• Confusing non-zero theta_13 with non-standard interactions in the solar neutrino sector
• Apparent multiple Delta m^2_32 in muon anti-neutrino and muon neutrino survival oscillations from non-standard interaction matter effect

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