Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-07-30
Phys.Rev. D65 (2002) 033006
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages. Added discussion on possible nu_e->anti-nu_{mu,tau} or nu_e->anti-nu_e transitions
Scientific paper
10.1103/PhysRevD.65.033006
Using the model independent method of Villante, Fiorentini, Lisi, Fogli, Palazzo, and the rates measured in the SNO and Super-Kamiokande solar neutrino experiment, we calculate the amount of active nu_mu or nu_tau present in the flux of solar neutrinos on Earth. We show that the probability of nu_e->nu_{mu,tau} transitions is larger than zero at 99.89% CL. We find that the averaged flux of nu_{mu,tau} on Earth is larger than 0.17 times the 8B nu_e flux predicted by the BP2000 Standard Solar Model at 99% CL. We discuss also the consequences of possible nu_e->anti-nu_{mu,tau} or nu_e->anti-nu_e transitions of solar neutrinos. We derive a model-independent lower limit of 0.52 at 99% CL for the ratio of the 8B nu_e flux produced in the Sun and its value in the BP2000 Standard Solar Model.
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