Measurement of the radiative decay of polarized muons in the MEG experiment

We studied the radiative muon decay μ + → e + ν ν ¯ γ by using for the first time an almost fully polarized muon source. We identified a large sample ( ∼ 13,000) of these decays in a total sample of 1.8 × 10 14 positive muon decays collected in the MEG experiment in the years 2009–2010 and measured...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 2016-02, Vol.76 (3), p.1-8, Article 108
Hauptverfasser: Baldini, A. M., Bao, Y., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiarello, G., Chiri, C., de Bari, A., De Gerone, M., D’Onofrio, A., Dussoni, S., Fujii, Y., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Graziosi, A., Grigoriev, D. N., Haruyama, T., Hildebrandt, M., Hodge, Z., Ieki, K., Ignatov, F., Iwamoto, T., Kaneko, D., Kang, Tae Im, Kettle, P.-R., Khazin, B. I., Khomutov, N., Korenchenko, A., Kravchuk, N., Lim, G. M. A., Mihara, S., Molzon, W., Mori, Toshinori, Mtchedlishvili, A., Nakaura, S., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Ootani, W., Panareo, M., Papa, A., Pepino, A., Piredda, G., Pizzigoni, G., Popov, A., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Sergiampietri, F., Signorelli, G., Tassielli, G. F., Tenchini, F., Uchiyama, Y., Venturini, M., Voena, C., Yamamoto, A., Yoshida, K., You, Z., Yudin, Yu. V.
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Sprache:eng
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Zusammenfassung:We studied the radiative muon decay μ + → e + ν ν ¯ γ by using for the first time an almost fully polarized muon source. We identified a large sample ( ∼ 13,000) of these decays in a total sample of 1.8 × 10 14 positive muon decays collected in the MEG experiment in the years 2009–2010 and measured the branching ratio B ( μ → e ν ν ¯ γ ) = ( 6.03 ± 0.14 ( stat . ) ± 0.53 ( sys . ) ) × 10 - 8 for E e > 45 MeV and E γ > 40 MeV , consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong quality check of the complete MEG experiment in the search for μ + → e + γ process.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-016-3947-6