KamLAND data and the solution to the solar neutrino problem

Abstract

4.8 . 10-5 eV². In the best fit point we predict for SNO: CC/NC = and or = 3.0 ± 0.8% (68% C.L.), and < 6% 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.]]>

Neutrino Mass Matrix in Terms of Up-Quark Masses

“…2 2θ 23 ∼ 0.98 − 1, tan 2 θ 12 ∼ 0.29 − 0.Up to here we have estimated the contribution from M ν side and this is fairly in a good approximation for estimating large mixing angles θ 23 and θ 12 . Also neutrino masses are determined from M ν only.…”

“…Recent results from KamLAND [1] have established the Large Mixing Angle (LMA) solution [2]. Combined with the observations by Super-Kamiokande [3,4] and SNO [5], this confirms that V M N S has two large mixing angles [6,7,8] Now the question is why such a large difference can exist between the quark and lepton sectors.…”

Particle physics phenomenology

“…We heard on KamLand data and the solution to the solar neutrino problem, by Pedro de Holanda, from UNICAMP [4]. The KamLand results present good agreement with predictions based on solar neutrino data.…”

“…Besides the already mentioned parallel talk [4] the contributions ranged from an introductory motivational review of flavor oscillation in vacuum and matter by G. A. Valdiviesso and M. Guzzo [39] to a contribution on detection of very high energy neutrinos. In this work by C. A. de Moura Junior and M. Guzzo [40], it is shown the observational potential of the Pierre Auger Observatory to detect ν τ with E ν τ ≈ 1EeV , from Double Bang events, meaning the interaction in the atmosphere of very high energy ν from extragalactic sources, providing in some cases a second shower from τ decay.…”

Solar Neutrino measurements

“…At present, these tests are limited by the lack of knowledge of θ 13 but when future measurements of that parameter are made, the unitarity of the MNSP matrix will place restrictions on possible contributions from sterile neutrinos and other physics, such as CPT violation when KamLAND data is included [25,26]. In addition, as has been pointed out by some authors [27], distortion of the energy spectrum could be possible for certain cases involving sterile neutrinos. (ii) Measurements of lower energy solar neutrinos (pp, pep, 7 Be, CNO) including realtime measurements via CC and ES reactions.…”