We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, μ+→e+X, X→γγ . This search uses a dataset resulting from 7.5×10^14 stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013. No significant excess is found in the mass region 20–45 MeV/c^2 for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20–40 MeV/c^2, down to O(10^−11) at 90% confidence level.

Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment

Chiri, C.
Methodology
;
Grancagnolo, F.
Methodology
;
Panareo, M.
Methodology
;
Tassielli, G. F.
Methodology
;
2020

Abstract

We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, μ+→e+X, X→γγ . This search uses a dataset resulting from 7.5×10^14 stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013. No significant excess is found in the mass region 20–45 MeV/c^2 for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20–40 MeV/c^2, down to O(10^−11) at 90% confidence level.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11587/443694
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