Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 80, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-020-8364-1
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Funding
- DOE (USA) [DEFG02-91ER40679]
- INFN (Italy)
- JSPS KAKENHI [JP22000004, JP26000004, JP17J04114]
- JSPS Core-to-Core Program, A. Advanced Research Networks (Japan) [JPJSCCA20180004]
- Schweizerischer Nationalfonds (SNF) [200021_137738, 200020_172706]
- Russian Federation Ministry of Education and Science
- Russian Fund for Basic Research [RFBR-14-22-03071]
- MIUR (Italy) [975]
- Swiss National Science Foundation (SNF) [200021_137738, 200020_172706] Funding Source: Swiss National Science Foundation (SNF)
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We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, mu(+) -> e(+)X,X -> gamma gamma. This search uses a dataset resulting from 7.5 x 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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