The $K_L\toπ^0ν\barν$ Decay in Models of Extended Scalar Sector

Details The $K_L\toπ^0ν\barν$ Decay in Models of Extended Scalar Sector The $K_L\toπ^0ν\barν$ Decay in Models of Extended Scalar Sector

2000-01-05

arxiv.org/abs/hep-ph/0001037v1

JHEP 0002 (2000) 043

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, LaTeX2e

Scientific paper

10.1088/1126-6708/2000/02/043

We calculate new contributions to the $K_L\to\pi^0\nu\bar\nu$ decay in models where neutrino Majorana masses require an extension of the scalar sector. First, we study a model where the neutrino mass is induced by the vacuum expectation value of an SU(2)-triplet scalar. Second, we study the Zee model where the Majorana mass comes from one loop diagrams involving a singly charged, SU(2)-singlet scalar. In both models, the Yukawa couplings that involve the new scalar and the neutrinos could be of order one. We find, however, that the contributions to the $K_L\to\pi^0\nu\bar\nu$ decay mediated by the new scalars depend on the neutrino masses rather than the Yukawa couplings and are, therefore, negligibly small.

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