Inverted hierarchy of neutrino masses disfavored by supernova 1987A |
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| Institution: | 1. Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan;2. Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan;3. School of Physics, Korea Institute for Advanced Study 207-43, Cheongryangri-dong, Dongdaemun-gu, Seoul 130-012, South Korea;4. Instituto de F??sica Gleb Wataghin, Universidade Estadual de Campinas – UNICAMP, PO Box 6165, 13083-970 Campinas SP, Brazil;1. International Business School, Beijing Foreign Studies University, China;2. Beijing National Accounting Institute, China;1. Institute for Advanced Materials, College of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China;2. Jiangsu Shunhang Electronic Technology, Zhangjiagang 215600, PR China;3. Hunan Engineering Laboratory of Power Battery Cathode Materials, Changsha Research Institute of Mining and Metallurgy, Changsha 410012, PR China |
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| 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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