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Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment
Preprint
A. M. Baldini ,
F. Berg ,
M. Biasotti ,
G. Boca ,
P. W. Cattaneo ,
G. Cavoto ,
F. Cei ,
M. Chiappini ,
G. Chiarello ,
C. Chiri ,
A. Corvaglia ,
A. de Bari ,
M. De Gerone ,
M. Francesconi ,
L. Galli ,
F. Gatti ,
F. Grancagnolo ,
M. Grassi ,
D. N. Grigoriev ,
M. Hildebrandt ,
Z. Hodge ,
K. Ieki ,
F. Ignatov ,
R. Iwai ,
T. Iwamoto ,
S. Kobayashi ,
P. -R. Kettle ,
W. Kyle ,
N. Khomutov ,
A. Kolesnikov ,
N. Kravchuk ,
N. Kuchinskiy ,
T. Libeiro ,
G. M. A. Lim ,
V. Malyshev ,
N. Matsuzawa ,
M. Meucci ,
S. Mihara ,
W. Molzon ,
Toshinori Mori ,
A. Mtchedilishvili ,
M. Nakao ,
H. Natori ,
D. Nicolò ,
H. Nishiguchi ,
M. Nishimura ,
S. Ogawa ,
R. Onda ,
W. Ootani ,
A. Oya ,
D. Palo ,
M. Panareo ,
A. Papa ,
V. Pettinacci ,
G. Pizzigoni ,
A. Popov ,
F. Renga ,
S. Ritt ,
A. Rozhdestvensky ,
M. Rossella ,
R. Sawada ,
P. Schwendimann ,
G. Signorelli ,
A. Stoykov ,
G. F. Tassielli ,
K. Toyoda ,
Y. Uchiyama ,
M. Usami ,
C. Voena ,
K. Yanai ,
Yu. V. Yudin
01 May 2020
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Abstract
We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, \(\mu^+ \to \mathrm{e}^+\mathrm{X}, \mathrm{X} \to \gamma\gamma\). This search uses a dataset resulting from \(7.5\times 10^{14}\) 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 \(\mathcal{O}(10^{-11})\) at 90\% confidence level.