$μ- e$ Conversion With Four Generations

Details $μ- e$ Conversion With Four Generations $μ- e$ Conversion With Four Generations

2011-06-25

arxiv.org/abs/1106.5085v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 11 pages with 3 figures. An error in figure corrected

Scientific paper

We study $\mu - e$ 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 $\mu - e$ conversion using experimental bounds on various nuclei with those from $\mu \to e \gamma$ and $\mu \to e\bar e e$. We find that the current bound from $\mu - e$ conversion with Au puts the most stringent constraint in this model. The relevant flavor changing parameter $\lambda_{\mu e} = V^*_{\mu 4}V_{e4}^{}$ is constrained to be less than $1.6\times 10^{-5}$ for the fourth generation neutrino mass larger than 100 GeV. Implications for future $\mu -e$ conversion, $\mu \to e\gamma$ and $\mu \to e\bar e e$ experiments are discussed.

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