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New limit on the lepton-flavor-violating decay μ+→e+γ.

Authors :
Adam J
Bai X
Baldini AM
Baracchini E
Bemporad C
Boca G
Cattaneo PW
Cavoto G
Cei F
Cerri C
de Bari A
De Gerone M
Doke T
Dussoni S
Egger J
Fratini K
Fujii Y
Galli L
Gallucci G
Gatti F
Golden B
Grassi M
Grigoriev DN
Haruyama T
Hildebrandt M
Hisamatsu Y
Ignatov F
Iwamoto T
Kettle PR
Khazin BI
Kiselev O
Korenchenko A
Kravchuk N
Maki A
Mihara S
Molzon W
Mori T
Mzavia D
Natori H
Nicolò D
Nishiguchi H
Nishimura Y
Ootani W
Panareo M
Papa A
Pazzi R
Piredda G
Popov A
Renga F
Ritt S
Rossella M
Sawada R
Sergiampietri F
Signorelli G
Suzuki S
Tenchini F
Topchyan C
Uchiyama Y
Valle R
Voena C
Xiao F
Yamada S
Yamamoto A
Yamashita S
Yudin YV
Zanello D
Source :
Physical review letters [Phys Rev Lett] 2011 Oct 21; Vol. 107 (17), pp. 171801. Date of Electronic Publication: 2011 Oct 17.
Publication Year :
2011

Abstract

We present a new result based on an analysis of the data collected by the MEG detector at the Paul Scherrer Institut in 2009 and 2010, in search of the lepton-flavor-violating decay μ(+)e(+)γ. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8×10(14) muon decays, gives a 90% C.L. upper limit of 2.4×10(-12) on the branching ratio of the μ(+)→e(+)γ decay, constituting the most stringent limit on the existence of this decay to date.<br /> (© 2011 American Physical Society)

Details

Language :
English
ISSN :
1079-7114
Volume :
107
Issue :
17
Database :
MEDLINE
Journal :
Physical review letters
Publication Type :
Academic Journal
Accession number :
22107507
Full Text :
https://doi.org/10.1103/PhysRevLett.107.171801