IMPLICATIONS OF THE RECENT SOLAR NEUTRINO EXPERIMENT FOR PARTICLE PHYSICS

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Abstract
Physical implications of the results of recent solar neutrino experiments from the Homestake, Kamioka and Baksan Laboratories are discussed. We argue that the results from Homestake and Kamioka, if the two data sets are combined, strongly suggest some unusual neutrino properties rather than the modification of astrophysical models of the sun. If the time variation of neutrino captures, as observed at Homestake, is a statistical fluke, the neutrino conversion in matter proposed by Mikheyev and Smirnov among several possibilities yields the most attractive explanation for the neutrino flux deficit. We remark that the solution includes the possibility predicted by simple SO(10) models and it is tested by the gallium experiment. If the time variation at Homestake is true, on the other hand, one must explain why such an effect is not seen at Kamiokande. We stress that it is still possible to make a particle physics model which explains the two apparently contradictory observations.

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