Lepton-number violating meson decays in theories beyond the Standard Model

Details Lepton-number violating meson decays in theories beyond the Standard Model Lepton-number violating meson decays in theories beyond the Standard Model

2011-12-14

arxiv.org/abs/1112.3269v2

Proc. of the Helmholtz International School "Heavy Quark Physics" (HQP08), Editors: A. Ali and M. A. Ivanov (DESY, Hamburg, 20

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures, 2 tables; a lecture given at the Helmholtz International School "Heavy Quark Physics" (HQP08), August 11-

Scientific paper

After discussion of mechanisms of lepton number violation, we consider meson decays $K^+ \to\pi^ - \ell ^ + \ell '^ +$ and $D^ + \to K^ - \ell ^ + \ell '^ +$ ($\ell,\ell ' = e,\mu $) with $\Delta L= 2$ in the Standard Model extended by massive Majorana neutrinos and in a supersymmetric extension of the Standard Model with explicit breaking of R-parity by trilinear or bilinear Yukawa couplings in the superpotential. We give estimates of the branching ratios for these decays and compare the effectiveness of various decay mechanisms taking into account present experimental bounds on lepton mixing, masses of neutrinos and superparticles, and R-parity violating couplings.

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