کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1844234 1527798 2008 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of lightest neutrino mass in leptogenesis
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
Effects of lightest neutrino mass in leptogenesis
چکیده انگلیسی

The effects of the lightest neutrino mass in “flavoured” leptogenesis are investigated in the case when the CP-violation necessary for the generation of the baryon asymmetry of the Universe is due exclusively to the Dirac and/or Majorana phases in the neutrino mixing matrix U. The type I see-saw scenario with three heavy right-handed Majorana neutrinos having hierarchical spectrum is considered. The “orthogonal” parametrisation of the matrix of neutrino Yukawa couplings, which involves a complex orthogonal matrix R, is employed. Results for light neutrino mass spectrum with normal and inverted ordering (hierarchy) are obtained. It is shown, in particular, that if the matrix R   is real and CP-conserving and the lightest neutrino mass m3m3 in the case of inverted hierarchical spectrum lies the interval 5×10−4 eV≲m3≲7×10−3 eV5×10−4 eV≲m3≲7×10−3 eV, the predicted baryon asymmetry can be larger by a factor of ∼100 than the asymmetry corresponding to negligible m3≅0m3≅0. As consequence, we can have successful thermal leptogenesis for 5×10−6 eV≲m3≲5×10−2 eV5×10−6 eV≲m3≲5×10−2 eV even if R is real and the only source of CP-violation in leptogenesis is the Majorana and/or Dirac phase(s) in U.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 797, Issues 1–2, 1 July 2008, Pages 93–116
نویسندگان
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