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Global analysis of the data from solar neutrinos having transition magnetic moment together.pdf

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Global analysis of the data from solar neutrinos having transition magnetic moment together

a r X i v : h e p - p h / 0 7 0 2 0 2 9 v 1 2 F e b 2 0 0 7 Global analysis of the data from solar neutrinos having transition magnetic moments together with KamLAND data D. Yilmaz and A.U. Yilmazer Department of Physics Engineering,Ankara University Tandogan,06100, Ankara TURKEY February 2, 2008 Abstract A global analysis of the solar neutrino data from all solar neutrino ex- periments combined with the KamLAND data is presented assuming that the solar neutrino deficit is due to the matter-enhanced spin-flavor preces- sion effect. We used two types of magnetic field profiles throughout the entire Sun: Wood-Saxon shape and the Gaussian shape. We showed that for Dirac neutrinos, the allowed regions are independent of the magnetic field profiles for all of the magnetic moments that we used in this paper and the allowed region in the large mixing angle (LMA) region shifted to the small mixing angle (SMA) region as μB value is increased. We calcu- lated the allowed regions at 95% CL. We also find a limit for the electron neutrino magnetic moment at 0.95CL so that μB 0.2 × 10?7μ B G for both magnetic field profiles at 1σlevel. 1.Introduction The earlier solar neutrino experiments (Homestake and all three Gallium experiments)[1? 4] showed deficits of the neutrino flux from the Sun when com- pared to the standard solar model(SSM) predictions[5]. One of the most popular solutions of this problem is MSW effect[6, 7]. In this solution, when electron neutrinos pass through the electronic matter, they are exposed to matter effects which can cause an almost complete conversion of electron neutrinos to another neutrino types. Another solution is the magnetic moment solution which we investigated in this paper. If the neutrinos have large magnetic moments and pass through a region with a magnetic field, the helicity of the neutrino can be flipped, then this spin flip changes the left-handed electron neutrino to a right handed electron neutrino that we cannot detect[8? 11]. L