Goldhaber replies to Esterling: As Bob Esterling implies, the challenge here is not producing reversed helicity but observing it: Reaction rates are tiny because of low neutrino density and small cross sections. Absent an independent calibration of neutrino density, there would be no characteristic signal of helicity reversal for Dirac neutrinos. If production of relic Majorana neutrinos were associated mostly with matter rather than antimatter, neutrino helicity equipartition still could lead to nearly equal production of electrons and positrons—a striking signal if it could be seen.
© 2012 American Institute of Physics.
2012
American Institute of Physics
