Solar neutrinos and 1-3 leptonic mixing

Goswami, Srubabati ; Smirnov, Alexei Yu. (2005) Solar neutrinos and 1-3 leptonic mixing Physical Review D: Particles, Fields, Gravitation, and Cosmology, 72 (5). Article ID 053011. ISSN 2470-0010

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Effects of the 1-3 leptonic mixing on the solar neutrino observables are studied and the signatures of nonzero θ13 are identified. For this we have rederived the formula for 3ν-survival probability including all relevant corrections and constructed the isocontours of observables in the sin 2θ12−sin 2θ13 plane. Analysis of the solar neutrino data gives sin 2θ13 = 0.007+0.080−0.007 (90% C.L.) for Δm2 = 8 × 10−5  eV2. The combination of the ratio CC/NC at Sudbury Neutrino Observatory (SNO) and gallium production rate selects 2θ13 = 0.017 ± 0.026 (1σ). The global fit of all oscillation data leads to zero best value of sin 2θ13. The sensitivity (1σ error) of future solar neutrino studies to sin 2θ13 can be improved down to 0.01–0.02 by precise measurements of the pp-neutrino flux and the CC/NC ratio as well as spectrum distortion at high (E > 4  MeV) energies. Combination of experimental results sensitive to the low and high energy parts of the solar neutrino spectrum resolves the degeneracy of angles θ13 and θ12. Comparison of sin 2θ13 as well as sin 2θ12 measured in the solar neutrinos and in the reactor/accelerator experiments may reveal new effects which cannot be seen otherwise.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:108709
Deposited On:01 Feb 2018 04:36
Last Modified:01 Feb 2018 04:36

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