One might think that each of the three masses has a different flavor, but the truth makes matters more confusing: the mass state of a neutrino does not precisely match up with the flavor state of a neutrino. We investigate the impact of prior models on the upper bound of the sum of neutrino masses, ∑m_≲0.15 eV (95% CI) this differs substantially from the physically motivated upper bound. The puny particles have masses of 0.8 electron volts or less, physicist Diana Parno reported April 19 at a virtual meeting of the American Physical Society. After a brief overview of the present knowledge of neutrino masses and mixing, we summarize what can be learned about physics beyond the standard model from the various proposed neu-trino experiments. Physicists have named these neutrinos mass 1, mass 2, and mass 3, though they can also be referred to as 1, 2, and 3.
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