What fraction of boron-8 solar neutrinos arrive at the earth as a nu(2) mass eigenstate?

Nunokawa, Hiroshi; Parke, Stephen J; Zukanovich Funchal, Renata

doi:10.1103/PhysRevD.74.013006

Title: What fraction of boron-8 solar neutrinos arrive at the earth as a nu(2) mass eigenstate?

Journal Article · Sun Jan 01 00:00:00 EST 2006 · Phys.Rev.D74:013006,2006

DOI:https://doi.org/10.1103/PhysRevD.74.013006· OSTI ID:892527

Nunokawa, Hiroshi; Parke, Stephen J; Zukanovich Funchal, Renata

We calculate the fraction of B{sup 8} solar neutrinos that arrive at the Earth as a nu{sub 2} mass eigenstate as a function of the neutrino energy. Weighting this fraction with the B{sup 8} neutrino energy spectrum and the energy dependence of the cross section for the charged current interaction on deuteron with a threshold on the kinetic energy of the recoil electrons of 5.5 MeV, we find that the integrated weighted fraction of nu{sub 2}'s to be 91 {+-} 2 % at the 95% CL. This energy weighting procedure corresponds to the charged current response of the Sudbury Neutrino Observatory (SNO). We have used SNO's current best fit values for the solar mass squared difference and the mixing angle, obtained by combining the data from all solar neutrino experiments and the reactor data from KamLAND. The uncertainty on the nu{sub 2} fraction comes primarily from the uncertainty on the solar delta m{sup 2} rather than from the uncertainty on the solar mixing angle or the Standard Solar Model. Similar results for the Super-Kamiokande experiment are also given. We extend this analysis to three neutrinos and discuss how to extract the modulus of the Maki-Nakagawa-Sakata mixing matrix element U{sub e2} as well as place a lower bound on the electron number density in the solar B{sup 8} neutrino production region.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC02-76CH03000

OSTI ID:: 892527

Report Number(s):: FERMILAB-PUB-05-049-T; arXiv eprint number hep-ph/0601198; TRN: US0701171

Journal Information:: Phys.Rev.D74:013006,2006, Journal Name: Phys.Rev.D74:013006,2006

Country of Publication:: United States

Language:: English

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Title: What fraction of boron-8 solar neutrinos arrive at the earth as a nu(2) mass eigenstate?

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