Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..45.1066t&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 45, Issue 4, 15 February 1992, pp.1066-1075
Physics
33
Scientific paper
Within the standard electroweak theory ``wrong-helicity'' neutrinos are produced in a nascent neutron star by ``spin-flip'' processes (at a rate proportional to m2ν), freely escape, and can lead to an excessively rapid cooling of the newly born neutron star. Previous work, based upon the neutrino-nucleon spin-flip scattering process alone, has shown that the observed cooling of the neutron star associated with SN 1987A excludes a Dirac-neutrino mass greater than ~20 keV for either νe, νμ, or ντ. We reexamine the emission of ``wrong-helicity'' Dirac neutrinos from SN 1987A and conclude that due to neutrino degeneracy and additional emission processes (N+N-->N+N+νν¯, π-+p-->n+νν¯) the effect of a Dirac neutrino on the cooling of SN 1987A has been IunderestimatedP. While a precise Dirac-mass limit awaits the incorporation of our new rates into detailed numerical cooling models, we believe that the limit that follows from the cooling of SN 1987A is better, probably much better, than 10 keV. In particular, we believe that SN 1987A definitely excludes a 17-keV (purely) Dirac-mass neutrino that mixes with the electron neutrino at the 1% level.
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