beta decay

Following the standard lore in type II seesaw dominant models, the dominant double beta decay rate in the [W.sub.L] - [W.sub.L] channel is expected to be dominated by the exchange of the LH Higgs triplet [[DELTA].sub.L] carrying [absolute value of (B - L)] = 2.

I present a new approach to the measurement of a, the electron-neutrino correlation, in neutron beta decay. A precise measurement of a can lead to a precise determination of ratio of the axial vector and vector coupling constants, [G.sub.a]/[G.sub.v].

Neutrinoless double beta decay (DBD) beyond SM is a high sensitivity unique probe for studying the Majorana nature of neutrinos (v), the absolute v-mass scales, the mass hierarchy, the right-handed weak interactions, and others beyond SM.

Key words: beta decay; cold neutrons; electroweak interactions; neutron decay; radiative corrections; radiative decay.

By keeping track of the numbers of electrons detected at different energies, the researchers can plot an energy spectrum for tritium beta decay. They can deduce an upper limit on the neutrino's mass from the difference between the highest electron energy detected and the theoretical prediction of what that energy would be if the neutrino had no mass.

In parallel, the construction of new detectors aimed at a direct measurement of the mass of the electron neutrino and of neutrinoless double beta decay has been completed or is approaching completion.

Beta decay of the neutron into a proton, electron, and electron antineutrino is occasionally accompanied by the emission of a photon.

Each beta decay produces not only an electron but also an invisible neutrino, and researchers have long relied on measurements of beta-decay spectra for information about the accompanying neutrinos.

Vissani, "New expectations and uncertainties on neutrinoless double beta decay," Physical Review D, vol.