期刊
PHYSICS LETTERS B
卷 552, 期 3-4, 页码 177-184出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(02)03130-1
关键词
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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. (C) 2002 Elsevier Science B.V. All rights reserved.
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