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

Here, we studied the radiative muon decay μ + → e +νν¯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 → eνν¯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.
Authors:
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Publication Date:
Grant/Contract Number:
FG02-91ER40679
Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 3; Journal ID: ISSN 1434-6044
Publisher:
Springer
Research Org:
Univ. of California, Irvine, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
The MEG Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1361412

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., and Yudin, Yu. V.. Measurement of the radiative decay of polarized muons in the MEG experiment. United States: N. p., Web. doi:10.1140/epjc/s10052-016-3947-6.
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.. Measurement of the radiative decay of polarized muons in the MEG experiment. United States. doi:10.1140/epjc/s10052-016-3947-6.
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., and Yudin, Yu. V.. 2016. "Measurement of the radiative decay of polarized muons in the MEG experiment". United States. doi:10.1140/epjc/s10052-016-3947-6. https://www.osti.gov/servlets/purl/1361412.
@article{osti_1361412,
title = {Measurement of the radiative decay of polarized muons in the MEG experiment},
author = {Baldini, A. M. and Bao, Y. and Baracchini, E. and Bemporad, C. and Berg, F. and Biasotti, M. and Boca, G. and Cattaneo, P. W. and Cavoto, G. and Cei, F. and Chiarello, G. and Chiri, C. and de Bari, A. and De Gerone, M. and D’Onofrio, A. and Dussoni, S. and Fujii, Y. and Galli, L. and Gatti, F. and Grancagnolo, F. and Grassi, M. and Graziosi, A. and Grigoriev, D. N. and Haruyama, T. and Hildebrandt, M. and Hodge, Z. and Ieki, K. and Ignatov, F. and Iwamoto, T. and Kaneko, D. and Kang, Tae Im and Kettle, P. -R. and Khazin, B. I. and Khomutov, N. and Korenchenko, A. and Kravchuk, N. and Lim, G. M. A. and Mihara, S. and Molzon, W. and Mori, Toshinori and Mtchedlishvili, A. and Nakaura, S. and Nicolò, D. and Nishiguchi, H. and Nishimura, M. and Ogawa, S. and Ootani, W. and Panareo, M. and Papa, A. and Pepino, A. and Piredda, G. and Pizzigoni, G. and Popov, A. and Renga, F. and Ripiccini, E. and Ritt, S. and Rossella, M. and Rutar, G. and Sawada, R. and Sergiampietri, F. and Signorelli, G. and Tassielli, G. F. and Tenchini, F. and Uchiyama, Y. and Venturini, M. and Voena, C. and Yamamoto, A. and Yoshida, K. and You, Z. and Yudin, Yu. V.},
abstractNote = {Here, we studied the radiative muon decay μ+ → e+νν¯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 1.8×1014 positive muon decays collected in the MEG experiment in the years 2009–2010 and measured the branching ratio B(μ → eνν¯γ)=(6.03 ± 0.14(stat.) ± 0.53(sys.))×10–8 for Ee > 45 MeV and Eγ > 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.},
doi = {10.1140/epjc/s10052-016-3947-6},
journal = {European Physical Journal. C, Particles and Fields},
number = 3,
volume = 76,
place = {United States},
year = {2016},
month = {2}
}