Yukawa Matrix for the Neutrino and Lepton Flavour Violation

Details Yukawa Matrix for the Neutrino and Lepton Flavour Violation Yukawa Matrix for the Neutrino and Lepton Flavour Violation

2004-11-18

arxiv.org/abs/hep-ph/0411240v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given by K. Tsumura at NuFact04, Osaka, Japan, July 26 - August 1,2004 - 3 pages, 2 figures

Scientific paper

10.1016/j.nuclphysbps.2005.05.06

We estimate the magnitude of Lepton Flavour Violation (LFV) from the phase of the neutrino Yukawa matrix. In the minimal supersymmetric standard model with right-handed neutrinos, the LFV processes l_i \to l_j \gamma can appear through the slepton mixing, which comes from the renormalization group effect on the right-handed neutrino Yukawa interaction between the Grand Unified Theory scale and the heavy right-handed neutrino mass scale. Two types of phases exist in the neutrino Yukawa matrix. One is the Majorana phase, which can change the magnitude of the LFV branching ratios by a few factor. The other phases relate for the size of the Yukawa hierarchy and its phase effect can change the LFV branching ratios by several orders of magnitude.

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