Status of LSND and possible dark matter implications

Details Status of LSND and possible dark matter implications Status of LSND and possible dark matter implications

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996nuphs..51..243c&link_type=abstract

Nuclear Physics B Proceedings Supplements, v. 51, p. 243-248.

Physics

Nuclear Physics

1

Scientific paper

The combined 1993, 1994, and 1995 data from the LSND experiment shows a statistically compelling excess of events of the type expected for μ -> e neutrino oscillations. An electron between 36 and 60 MeV is identified by Cherenkov and scintillation light from ep -> e+n, and if a y is tightly constrained to be correlated with it from np -> dy (2.2 MeV), then 22 such events are observed, but only 4.6 +/- 0.6 are expected from backgrounds. If subsequent analysis shows a similar effect from the independent channel νμ -> νe, then this would imply a neutrino mass difference which would contribute significantly to the dark matter of the universe. Explaining also the solar and atmospheric neutrino deficits results in a neutrino mass pattern which gives a cold + hot dark matter mix which fits the structure of the universe on all scales and requires a critical density universe and a universe age compatible with that of the oldest stars. Further evidence for this mass pattern comes from the production of heavy elements in supernovae.

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