We point out that neutrino events observed at Kamiokande and IMB from SN1987A disfavor the neutrino oscillation parameters preferred by the LSND experiment. For Deltam(2) > 0 (the light side), the electron neutrinos from the neutronization burst would be lost, while the first event at Kamiokande is quite likely to be due to an electron neutrino. For Deltam(2) (e) events is already lower than the theoretical expectations, which would 0 aet aggravated by a complete conversion from )over bar>(mu) to )over bar>(e). If taken seriously, the LSND data are disfavored independent of the existence of a sterile neutrino. A possible remedy is CPT violation, which allows different mass spectra for neutrinos and anti-neutrinos and hence can accommodate atmospheric, solar and LSND data without a sterile neutrino. If this is the case, Mini-BooNE must run in )over bar> rather than the planned nu mode to test the LSND signal. We speculate on a possible origin of CPT violation. (C) 2001 Published by Elsevier Science B.V. References: 43
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