High precision measurements of θ in the solar and reactor neutrino experiments

Bandyopadhyay, Abhijit ; Choubey, Sandhya ; Goswami, Srubabati ; Petcov, S. T. (2005) High precision measurements of θ in the solar and reactor neutrino experiments Physical Review D: Particles, Fields, Gravitation, and Cosmology, 72 (3). Article ID 033013. ISSN 2470-0010

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Official URL: https://journals.aps.org/prd/abstract/10.1103/Phys...

Related URL: http://dx.doi.org/10.1103/PhysRevD.72.033013


We discuss the possibilities of high precision measurement of the solar neutrino mixing angle θ ≡ θ12 in solar and reactor neutrino experiments. The improvements in the determination of sin2θ12, which can be achieved with the expected increase of statistics and reduction of systematic errors in the currently operating solar and KamLAND experiments, are summarized. The potential of LowNu ν−e elastic scattering experiment, designed to measure the pp solar neutrino flux, for high precision determination of sin2θ12, is investigated in detail. The accuracy in the measurement of sin2θ12, which can be achieved in a reactor experiment with a baseline L∼(50–70)  km, corresponding to a Survival Probability Minimum (SPMIN) is thoroughly studied. We include the effect of the uncertainty in the value of sin2θ13 in the analyses. A LowNu measurement of the pp neutrino flux with a 1% error would allow to determine sin2θ12 with an error of 14% (17%) at 3σ from a two-generation (three-generation) analysis. The same parameter sin2θ12 can be measured with an uncertainty of 2% (6%) at 1σ (3σ) in a reactor experiment with L∼60  km, statistics of ∼60 GWkTy and systematic error of 2%. For the same statistics, the increase of the systematic error from 2% to 5% leads to an increase in the uncertainty in sin2θ12 from 6% to 9% at 3σ. The inclusion of the sin2θ13 uncertainty in the analysis changes the error on sin2θ12 to 3% (9%). The effect of sin2θ13 uncertainty on the sin2θ12 measurement in both types of experiments is considerably smaller than naively expected.

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