PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Quark and Lepton Flavour Physics
BSM search in rare muon decay: the MEG II experiment
K. Ieki* on behalf of the MEG-II collaboration
*corresponding author
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Pre-published on: January 29, 2021
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Abstract
Lepton flavor violating decay of muon is one of the best probes for physics beyond the Standard Model (BSM). A golden channel, $\mu\to e\gamma$, will be searched by the MEG II experiment. MEG II aims to search $\mu\to e\gamma$ with ten times better branching ratio sensitivity than MEG, $6 \times 10^{-14}$ (90\% C.L.). Many well motivated BSM theories predict sizable branching ratio of this decay (e.g. $\mathcal{O}(10^{-14}$) in SUSY-seesaw), which is within the reach of MEG II.
MEG II utilizes world's highest intensity continuous $\mu^{+}$ beam ($7 \times 10^{7}$ muons/s) at Paul Scherrer Institute (PSI). In order to cope with extremely high rate accidental background of $e^{+}$ and $\gamma$, all the detectors are upgraded from MEG. Detectors are installed and commissioned with muon beam at PSI. We present the status and prospect of the MEG II experiment.
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