Neutrino masses from beta decays after KamLAND and WMAP (Updated including the NC enhanced SNO data)

Abstract

The first data released by the KamLAND collaboration have confirmed the strong evidence in favour of the LMA solution of the solar neutrino problem. Taking into account the ranges for the oscillation parameters allowed by the global analysis of the solar, CHOOZ and KamLAND data, we update the limits on the neutrinoless double beta decay effective neutrino mass parameter and analyze the impact of all the available data from neutrinoless double beta decay experiments on the neutrino mass bounds, in view of the latest WMAP results. For the normal neutrino mass spectrum the range (0.05-0.23) eV is obtained for the lightest neutrino mass if one takes into account the Heidelberg-Moscow evidence for neutrinoless double beta decay and the cosmological bound. It is also shown that under the same conditions the mass of the lightest neutrino may not be bounded from below if the spectrum is of the inverted type. Finnaly, we discuss how future experiments can improve the present bounds on the lightest neutrino mass set by the Troitsk, Mainz and WMAP results. In the addendum we update the allowed ranges for the effective Majorana neutrino mass parameter in view of the latest NC enhanced SNO data.

Updated including the recent NC enhanced SNO data. Refferences added and typos corrected

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• Improved Limit on theta_{13} and Implications for Neutrino Masses in Neutrino-less Double Beta Decay and Cosmology
• What can we learn from neutrinoless double beta decay experiments?
• Majorana Neutrinos, Neutrino Mass Spectrum and the |<m>| ~ 0.001 eV Frontier in Neutrinoless Double Beta Decay
• Neutrinoless Double Beta Decay and Future Neutrino Oscillation Precision Experiments
• The Majorana neutrino masses, neutrinoless double beta decay and nuclear matrix elements
• Neutrinoless Double Beta Decay in Light of SNO Salt Data
• Aspects of thermal leptogenesis in braneworld cosmology
• Minimal inverse-seesaw mechanism with Abelian flavour symmetries
• Neutrino Masses, Mixing and New Physics Effects
• Phenomenology of Absolute Neutrino Masses
• Protecting the primordial baryon asymmetry in the seesaw model compatible with WMAP and KamLAND
• Flavored Peccei-Quinn symmetries in the minimal $\nu$DFSZ model
• Relation between CKM and MNS Matrices Induced by Bi-Maximal Rotations in the Seesaw Mechanism