The MEG experiment, designed to search for the μ ⁺ → e⁺ γ decay, completed data-taking in 2013 reaching a sensitivity level of 5.3× 10⁻¹³ for the branching ratio. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 6× 10⁻¹⁴ , a total upgrade, involving substantial changes to the experiment, has been undertaken, known as MEG II. We present both the motivation for the upgrade and a detailed overview of the design of the experiment and of the expected detector performance.
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Baldini et al. (2018) studied this question.
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