کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1840947 1031268 2012 27 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Neutrino masses and a fourth generation of fermions
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
Neutrino masses and a fourth generation of fermions
چکیده انگلیسی

We study neutrino mass generation in models with four chiral families of leptons and quarks and four right handed neutrinos. Generically, in these models there are three different contributions to the light neutrino masses: the usual see-saw contribution, the tree-level contribution due to mixing of light neutrinos with neutrino of the fourth generation, and the two loop contribution due to the Majorana mass term of the fourth neutrino. We study properties of these contributions and their experimental bounds. The regions of the parameters (mixings of the fourth neutrino, masses of RH neutrino components, etc.) have been identified where various contributions dominate. New possibilities of a realisation of the flavour symmetries in the four family context are explored. In particular, we consider applications of the smallest groups, e.g.  SG(20,3)SG(20,3), with irreducible representation 4̲.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 857, Issue 1, 1 April 2012, Pages 1–27
نویسندگان
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