Seesaw mechanism, baryon asymmetry and neutrinoless double beta decay

Details Seesaw mechanism, baryon asymmetry and neutrinoless double beta decay Seesaw mechanism, baryon asymmetry and neutrinoless double beta decay

2002-04-29

arxiv.org/abs/hep-ph/0204335v2

Phys.Rev. D66 (2002) 053001

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, RevTex. Revised

Scientific paper

10.1103/PhysRevD.66.053001

A simplified but very instructive analysis of the seesaw mechanism is here performed. Assuming a nearly diagonal Dirac neutrino mass matrix, we study the forms of the Majorana mass matrix of right-handed neutrinos, which reproduce the effective mass matrix of left-handed neutrinos. As a further step, the important effect of a non diagonal Dirac neutrino mass matrix is explored. The corresponding implications for the baryogenesis via leptogenesis and for the neutrinoless double beta decay are reviewed. We propose two distinct models where the baryon asymmetry is enhanced.

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