کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1842916 1645187 2006 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Majorana CP-violating phases, RG running of neutrino mixing parameters and charged lepton flavour violating decays
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
Majorana CP-violating phases, RG running of neutrino mixing parameters and charged lepton flavour violating decays
چکیده انگلیسی

We consider the MSSM with see-saw mechanism of neutrino mass generation and soft SUSY breaking with flavour-universal boundary conditions at the GUT scale, in which the lepton flavour violating (LFV) decays μ→e+γμ→e+γ, τ→μ+γτ→μ+γ, etc., are predicted with rates that can be within the reach of present and planned experiments. These predictions depend critically on the matrix of neutrino Yukawa couplings YνYν which can be expressed in terms of the light and heavy right-handed (RH) neutrino masses, neutrino mixing matrix UPMNSUPMNS, and an orthogonal matrix R. We investigate the effects of Majorana CP-violation phases in UPMNSUPMNS, and of the RG running of light neutrino masses and mixing angles from MZMZ to the RH Majorana neutrino mass scale MRMR, on the predictions for the rates of LFV decays μ→e+γμ→e+γ, τ→μ+γτ→μ+γ and τ→e+γτ→e+γ. The case of quasi-degenerate heavy RH Majorana neutrinos is considered. Results for neutrino mass spectrum with normal hierarchy, values of the lightest ν  -mass in the range 0⩽m1⩽0.30 eV0⩽m1⩽0.30 eV, and in the cases of R=1R=1 and complex matrix R≠1R≠1 are presented. We find that the effects of the Majorana CP-violation phases and of the RG evolution of neutrino mixing parameters can change by few orders of magnitude the predicted rates of the LFV decays μ→e+γμ→e+γ and τ→e+γτ→e+γ. The impact of these effects on the τ→μ+γτ→μ+γ decay rate is typically smaller and only possible for m1≳0.10 eVm1≳0.10 eV. If the RG running effects are negligible, in a large region of soft SUSY breaking parameter space the ratio of the branching ratios of the μ→e+γμ→e+γ and τ→e+γτ→e+γ (τ→μ+γτ→μ+γ) decays is entirely determined in the case of R≅1R≅1 by the values of the neutrino mixing parameters at MZMZ.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 738, Issues 1–2, 20 March 2006, Pages 219–242
نویسندگان
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