Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-18
JCAP 0302 (2003) 001
Physics
High Energy Physics
High Energy Physics - Phenomenology
References and 2 new figures (including pull-off diagram) added, discussion of spectrum distortion at KamLAND is extended, typ
Scientific paper
10.1088/1475-7516/2003/02/001
The first KamLAND results are in a 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 f_B. The best fit values of neutrino parameters are Delta m^2 = 7.3e-5 eV^2, tg^2 theta = 0.41 and f_B = 1.05 with the 1 sigma intervals: Delta m^2 = (6.2 - 8.4)e-5 eV^2, tg^2 theta = 0.33 - 0.54. We find the 3 sigma upper bounds: Delta m^2 < 2.8e-4 eV^2 and tg^2 theta < 0.84, and the lower bound Delta m^2 > 4e-5 eV^2. At 99% C.L. the KamLAND spectral result splits the LMA region into two parts with the preferred one at Delta m^2 < 1e-4 eV^2. The higher Delta m^2 region is accepted at about 2 sigma level. We show that effects of non-zero 13-mixing, sin^2 theta_{13} < 0.04, are small leading to a slight improvement of the fit in higher Delta m^2 region. In the best fit point we predict for SNO: CC/NC = 0.33 +0.05-0.03 and A_{DN}(SNO) = 2.8+-0.8 % (68% C.L.), and A_{DN}(SNO) < 9 % at the 3 sigma level. Further improvements in the determination of the parameters are discussed and implications of the solar neutrino and KamLAND results are considered.
de Holanda Pedro Cunha
Smirnov Alexei Yu.
No associations
LandOfFree
LMA MSW solution of the solar neutrino problem and first KamLAND results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with LMA MSW solution of the solar neutrino problem and first KamLAND results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and LMA MSW solution of the solar neutrino problem and first KamLAND results will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-575692