The CHORUS Neutrino Oscillation Experiment and the Prospects for the Tau-Neutrino Mass

摘要

Massive neutrinos can be rather naturally accommodated in the Standard Model, as there is no known ad hoc principle which would require neutrinos to have zero mass. Hence, with neutrinos of all three generations produced profusely during the early phases of the Big Bang (N_v ～ N_γ ～ 10~(10). N_(Baryon) ～ 10~(90)), there is the intriguing possibility that primordial neutrinos constitute the overwhelming fraction of the mass of the Universe, and, in fact, allow the mass density parameter Ω = ρ/ρ_(critical) to become unity (which is the preferred value of any inflationary scenario), even if the masses are as small as some tens of eV.