New constraint on the existence of the μ+→e +γ decay

J. Adam, X. Bai, A. M. Baldini, E. Baracchini, C. Bemporad, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei, C. Cerri, A. De Bari, M. De Gerone, T. Doke, S. Dussoni, J. Egger, Y. Fujii, L. Galli, F. Gatti, B. Golden, M. GrassiA. Graziosi, D. N. Grigoriev, T. Haruyama, M. Hildebrandt, Y. Hisamatsu, F. Ignatov, T. Iwamoto, D. Kaneko, P. R. Kettle, B. I. Khazin, N. Khomotov, O. Kiselev, A. Korenchenko, N. Kravchuk, G. Lim, A. Maki, S. Mihara, W. Molzon, T. Mori, D. Mzavia, R. Nardò, H. Natori, D. Nicolò, H. Nishiguchi, Y. Nishimura, W. Ootani, M. Panareo, A. Papa, G. Piredda, A. Popov, F. Renga, E. Ripiccini, S. Ritt, M. Rossella, R. Sawada, F. Sergiampietri, G. Signorelli, S. Suzuki, F. Tenchini, C. Topchyan, Y. Uchiyama, C. Voena, F. Xiao, S. Yamada, A. Yamamoto, S. Yamashita, Z. You, Yu V. Yudin, D. Zanello

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Abstract

The analysis of a combined data set, totaling 3.6×1014 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.

Original languageEnglish
Article number201801
JournalPhysical review letters
Volume110
Issue number20
DOIs
Publication statusPublished - 2013 May 13
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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., ... Zanello, D. (2013). New constraint on the existence of the μ+→e +γ decay. Physical review letters, 110(20), [201801]. https://doi.org/10.1103/PhysRevLett.110.201801