LMA MSW solution of the solar neutrino problem and first KamLAND results

Details LMA MSW solution of the solar neutrino problem and first KamLAND results LMA MSW solution of the solar neutrino problem and first KamLAND results

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jcap...02..001d&link_type=abstract

Journal of Cosmology and Astroparticle Physics, Issue 02, pp. 001 (2003).

Physics

50

Scientific paper

The first KamLAND results are shown to be in very good agreement with the predictions made on the basis of the solar neutrino data and the LMA realization of the MSW mechanism. We perform a combined analysis of the KamLAND (rate, spectrum) and the solar neutrino data with a free boron neutrino flux fB. The best fit values of neutrino parameters are Deltam2 = 7.3×10-5 eV2, tan2theta = 0.41 and fB = 1.05 with the 1sigma intervals: Deltam2 = (6.2 8.4)×10-5 eV2, tan2theta = 0.33 0.54. We find the 3sigma upper bounds: Deltam2 < 2.8×10-4 eV2 and tan2theta < 0.84, and the lower bound Deltam2 > 4×10-5 eV2. At 99% CL the KamLAND spectral result splits the LMA region into two parts with the preferred one at Deltam2 < 10-4 eV2. The higher Deltam2 region is accepted at about the 2sigma level. We show that effects of non-zero 13-mixing, sin2theta13 leq 0.04, are small, leading to a slight improvement of the fit in the higher Deltam2 region. At the best fit point we predict for SNO: CC/NC = 0.33+0.05-0.03 and ADNSNO = 2.8+/-0.8% (68% CL), and ADNSNO < 9% at the 3sigma level. Further improvements in the determination of the oscillation parameters are discussed and implications of the solar neutrino and KamLAND results are considered.

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