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arXiv 1303.0754hep-exphysics.ins-det
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mu ~+-> e ~+ γ衰变存在的新限制

New constraint on the existence of the mu+-> e+ gamma decay

MEG Collaboration, 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… 展开作者

MEG Collaboration, 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, K. Fratini, Y. Fujii, L. Galli, G. Gallucci, F. Gatti, B. Golden, M. Grassi, A. 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. Nardo, H. Natori, D. Nicolo, H. Nishiguchi, Y. Nishimura, W. Ootani, M. Panareo, A. Papa, R. Pazzi, 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, R. Valle, C. Voena, F. Xiao, S. Yamada, A. Yamamoto, S. Yamashita, Z. You, Yu. V. Yudin, D. Zanello

摘要:

本文分析了在寻找轻子味破坏衰变μ ^+ -> e^+ γ时,在靶上总共有3.6 \times 10^14个停止μ子的组合数据集。保罗·谢勒研究所的MEG实验收集到的数据显示,与背景预期相比,没有出现过多的事件,并得出了该衰变分支比的新上限为5.7 \times 10^-13(90%置信水平)。这比MEG之前设定的世界最佳限值严格四倍。

英文摘要:

The analysis of a combined data set, totaling 3.6 \times 10^14 stopped muons on target, in the search for the lepton flavour violating decay mu^+ -> e^+ gamma 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 \times 10^-13 (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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