μ–e conversion with four generations

We study μ–e conversion with sequential four generations. A large mass for the fourth generation neutrino can enhance the conversion rate by orders of magnitude. We compare constraints obtained from μ–e conversion using experimental bounds on various nuclei with those from μ→eγ and μ→ee¯e. We find t...

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Bibliographic Details
Published in:Physics letters. B 2011-09, Vol.703 (5), p.562-566
Main Authors: Deshpande, N.G., Enkhbat, T., Fukuyama, T., He, X.-G., Tsai, L.-H., Tsumura, K.
Format: Article
Language:English
Subjects:
Constraints
Conversion
Elementary particles
Exact sciences and technology
Gold
Mathematical models
Neutrinos
Nuclear physics
Physics
The physics of elementary particles and fields
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Summary:We study μ–e conversion with sequential four generations. A large mass for the fourth generation neutrino can enhance the conversion rate by orders of magnitude. We compare constraints obtained from μ–e conversion using experimental bounds on various nuclei with those from μ→eγ and μ→ee¯e. We find that the current bound from μ–e conversion with Au puts the most stringent constraint in this model. The relevant flavor changing parameter λμe=Vμ4⁎Ve4 is constrained to be less than 1.6×10−5 for the fourth generation neutrino mass larger than 100 GeV. Implications for future μ–e conversion, μ→eγ and μ→ee¯e experiments are discussed.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2011.08.045