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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, Fujii Y, Galli L, Gatti F, Golden B, Grassi M, Graziosi A, Grigoriev DN, Haruyama T, Hildebrandt M, Hisamatsu Y, Ignatov F, Iwamoto T, Kaneko D, Kettle PR, Khazin BI, Khomotov N, Kiselev O, Korenchenko A, Kravchuk N, Lim G, Maki A, Mihara S, Molzon W, Mori T, Mzavia D, Nardò R, Natori H, Nicolò D, Nishiguchi H, Nishimura Y, Ootani W, Panareo M, Papa A, Piredda G, Popov A, Renga F, Ripiccini E, Ritt S, Rossella M, Sawada R, Sergiampietri F, Signorelli G, Suzuki S, Tenchini F, Topchyan C, Uchiyama Y, Voena C, Xiao F, Yamada S, Yamamoto A, Yamashita S, You Z, Yudin YV, Zanello D. New constraint on the existence of the μ+ → e+ γ decay. PHYSICAL REVIEW LETTERS 2013; 110:201801. [PMID: 25167396 DOI: 10.1103/physrevlett.110.201801] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Indexed: 06/03/2023]
Abstract
The analysis of a combined data set, totaling 3.6 × 10(14) stopped muons on target, in the search for the lepton flavor violating decay μ(+) → e(+)γ is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 × 10(-13) (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.
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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. New limit on the lepton-flavor-violating decay μ+→e+γ. PHYSICAL REVIEW LETTERS 2011; 107:171801. [PMID: 22107507 DOI: 10.1103/physrevlett.107.171801] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2011] [Indexed: 05/31/2023]
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.
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