The Effective Lagrangian for the Seesaw Model of Neutrino Mass and Leptogenesis

Details The Effective Lagrangian for the Seesaw Model of Neutrino Mass and Leptogenesis The Effective Lagrangian for the Seesaw Model of Neutrino Mass and Leptogenesis

2002-10-21

arxiv.org/abs/hep-ph/0210271v2

Phys.Lett.B552:177-184,2003; Erratum-ibid.B636:330-331,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Formulae corrected in Table 3

Scientific paper

10.1016/j.physletb.2006.04.003

The effective Lagrangian for the seesaw model is derived including effects due to CP violation. Besides the usual dimension-5 operator responsible for light neutrino masses, a dimension-6 operator is obtained. For three or less heavy neutrino generations, the inclusion of both operators is necessary and sufficient for all independent physical parameters of the high-energy seesaw Lagrangian to appear in the low-energy effective theory, including the CP-odd phases relevant for leptogenesis. The dimension-6 operator implies exotic low-energy couplings for light neutrinos, providing a link between the high-energy physics and low-energy observables.

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