Abstract
The MEG experiment searches for the decay μ + → e + γ , which is strictly forbidden in the Standard model, while new theories, such as supersymmetric grand unified theory and seesaw model of neutrinos, predict observable branching ratio just below the current upper limit. The data taking for this search was started in 2008, and the physics run was performed for three months this year. Analysis of this 2008 data gives an upper limit BR ( μ + → e + γ ) ⩽ 2.8 × 10 − 11 ( 90 % C . L . ) .
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