Low-energy neutrino physics and neutrino mass

Among the principal concerns in neutrino physics today are the questions of whether neutrinos are massive and, if so, whether the neutrinos emitted in a weak decay are pure or mixed quantum states. This article focuses on recent developments in the phenomenology of low-energy neutrino physics to the extent that it provides information on neutrino mass and mixing. The authors discuss neutrino decay, experiments on neutrino oscillations, kinematic mass measurements, searches for heavy neutrino admixtures, and studies of neutrinoless double beta decay. Neutrino physics at low energies is capable of providing sensitive tests for neutrino mass and neutrino mixing in a manner complementary to the efforts in high-energy physics