2004/10/31 by Abhijit Bandyopadhyay, Sandhya Choubey, Srubabati Goswami +3 · 5 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #astro-ph #hep-ex #hep-ph #nucl-ex
paper · pdf · doi:10.1103/physrevd.72.033013
published as Phys.Rev.D72:033013,2005 · Final version
openalex publication_date 2005/08/15 · arxiv created 2005/08/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We discuss the possibilities of high precision measurement of the solar neutrino mixing angle \ensuremathθ_\ensuremath\bigodot\ensuremath≡\ensuremathθ12 in solar and reactor neutrino experiments. The improvements in the determination of sin2\ensuremathθ12, 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 \ensuremathν\ensuremath-e elastic scattering experiment, designed to measure the pp solar neutrino flux, for high precision determination of sin2\ensuremathθ12, is investigated in detail. The accuracy in the measurement of sin2\ensuremathθ12, which can be achieved in a reactor experiment with a baseline L\ensuremath∼(50--70) km, corresponding to a survival probability minimum (SPMIN), is thoroughly studied. We include the effect of the uncertainty in the value of sin2\ensuremathθ13 in the analyses. A LowNu measurement of the pp neutrino flux with a 1% error would allow to determine sin2\ensuremathθ12 with an error of 14% (17%) at 3\ensuremathσ from a two-generation (three-generation) analysis. The same parameter sin2\ensuremathθ12 can be measured with an uncertainty of 2% (6%) at 1\ensuremathσ (3\ensuremathσ) in a reactor experiment with L\ensuremath∼60 km, statistics of \ensuremath∼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 sin2\ensuremathθ12 from 6% to 9% at 3\ensuremathσ. The inclusion of the sin2\ensuremathθ13 uncertainty in the analysis changes the error on sin2\ensuremathθ12 to 3% (9%). The effect of sin2\ensuremathθ13 uncertainty on the sin2\ensuremathθ12 measurement in both types of experiments is considerably smaller than naively expected.