Inverted Hierarchy of Neutrino Masses Disfavored by Supernova 1987A
Hisakazu Minakata, Hiroshi Nunokawa
Abstract
We discuss the flavor conversion of supernova neutrinos in the three-flavor mixing scheme of neutrinos. We point out that by neutrino observation from supernova one can discriminate the inverted hierarchy of neutrino masses from the normal one if s132 a few × 10-4, irrespective of which oscillation solution to the solar neutrino problem is realized in nature. We perform an analysis of data of SN1987A and obtain a strong indication that the inverted mass hierarchy is disfavored unless s132 a few × 10-4.
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