Radiative tritium beta-decay and the neutrino mass

Details Radiative tritium beta-decay and the neutrino mass Radiative tritium beta-decay and the neutrino mass

2004-07-06

arxiv.org/abs/hep-ph/0407077v3

Phys.Lett. B598 (2004) 188-196

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 4 eps figures; discussion, figure added

Scientific paper

10.1016/j.physletb.2004.08.006

The shape of the electron energy spectrum in 3H beta-decay permits a direct assay of the absolute scale of the neutrino mass; a highly accurate theoretical description of the electron energy spectrum is necessary to the empirical task. We update Sirlin's calculation of the outer radiative correction to nuclear beta-decay to take into account the non-zero energy resolution of the electron detector. In previous 3H beta-decay studies the outer radiative corrections were neglected all together; only Coulomb corrections to the spectrum were included. This neglect artificially pushes m_nu^2 < 0 in a potentially significant way. We present a computation of the theoretical spectrum appropriate to the extraction of the neutrino mass in the sub-eV regime.

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