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Advances in High Energy Physics
Volume 2007 (2007), Article ID 82674, 15 pages
Research Article

Getting Information on |Ue3|2 from Neutrinoless Double Beta Decay

Max-Planck-Institut für Kernphysik, Postfach 10 39 80, Heidelberg 69029, Germany

Received 21 July 2007; Revised 17 October 2007; Accepted 31 December 2007

Academic Editor: Kate Scholberg

Copyright © 2007 Alexander Merle and Werner Rodejohann. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We consider the possibility to gain information on the lepton mixing matrix element |Ue3| from an improved experimental limit on the effective neutrino mass governing neutrinoless double beta decay. We show that typically a lower limit on |Ue3| as a function of the smallest neutrino mass can be set. Furthermore, we give the values of the sum of neutrino masses and |Ue3| which are allowed and forbidden by an experimental upper limit on the effective mass. Alternative explanations for neutrinoless double beta decay, Dirac neutrinos or unexplained cosmological features would be required if future measurements showed that the values lie in the respective regions. Moreover, we show that a measurement of |Ue3| from neutrinoless double beta decay is very difficult due to the expected errors on the effective mass and the oscillation parameters.