Towards absolute neutrino masses
arXiv:hep-ph/0611210 · doi:10.1016/j.nuclphysbps.2007.02.016
Abstract
Various ways of determining the absolute neutrino masses are briefly reviewed and their sensitivities compared. The apparent tension between the announced but unconfirmed observation of the $0νββ$ decay and the neutrino mass upper limit based on observational cosmology is used as an example of what could happen eventually. The possibility of a ``nonstandard'' mechanism of the $0νββ$ decay is stressed and the ways of deciding which of the possible mechanisms is actually operational are described. The importance of the $0νββ$ nuclear matrix elements is discussed and their uncertainty estimated.
Invited talk at the NOW2006 Workshop, Otranto, Italy, September 2006