New Limit on the Lepton-Flavor-Violating Decay μ+ → e+γ

被引：210

作者：

Adam, J. ^{[1
,2
]}

Bai, X. ^{[3
]}

Baldini, A. M. ^{[4
]}

Baracchini, E. ^{[6
]}

Bemporad, C. ^{[4
,5
]}

Boca, G. ^{[7
,8
]}

Cattaneo, P. W. ^{[7
]}

Cavoto, G. ^{[9
]}

Cei, F. ^{[4
,5
]}

Cerri, C. ^{[4
]}

de Bari, A. ^{[7
,8
]}

De Gerone, M. ^{[10
,11
]}

Doke, T. ^{[12
]}

Dussoni, S. ^{[10
,11
]}

Egger, J. ^{[1
]}

Fratini, K. ^{[10
,11
]}

Fujii, Y. ^{[3
]}

Galli, L. ^{[4
,5
]}

Gallucci, G. ^{[4
,5
]}

Gatti, F. ^{[10
,11
]}

Golden, B. ^{[6
]}

Grassi, M. ^{[4
]}

Grigoriev, D. N. ^{[13
]}

Haruyama, T. ^{[14
]}

Hildebrandt, M. ^{[1
]}

Hisamatsu, Y. ^{[3
]}

Ignatov, F. ^{[13
]}

Iwamoto, T. ^{[3
]}

Kettle, P. -R. ^{[1
]}

Khazin, B. I. ^{[13
]}

Kiselev, O. ^{[1
]}

Korenchenko, A. ^{[15
]}

Kravchuk, N. ^{[15
]}

Maki, A. ^{[14
]}

Mihara, S. ^{[14
]}

Molzon, W. ^{[6
]}

Mori, T. ^{[3
]}

Mzavia, D. ^{[15
]}

Natori, H. ^{[1
,3
]}

Nicolo, D. ^{[4
,5
]}

Nishiguchi, H. ^{[14
]}

Nishimura, Y. ^{[3
]}

Ootani, W. ^{[3
]}

Panareo, M. ^{[16
,17
]}

Papa, A. ^{[1
]}

Pazzi, R. ^{[4
,5
]}

Piredda, G. ^{[9
]}

Popov, A. ^{[13
]}

Renga, F. ^{[1
,9
]}

Ritt, S. ^{[1
]}

机构：

[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[2] ETH, Swiss Fed Inst Technol, CH-8093 Zurich, Switzerland

[3] Univ Tokyo, ICEPP, Bunkyo Ku, Tokyo 1130033, Japan

[4] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

[5] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy

[6] Univ Calif Irvine, Irvine, CA 92697 USA

[7] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

[8] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy

[9] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[10] Ist Nazl Fis Nucl, Sez Genovaa, I-16146 Genoa, Italy

[11] Univ Genoa, Dipartimento Fisicab, I-16146 Genoa, Italy

[12] Waseda Univ, Res Inst Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan

[13] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[14] High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 3050801, Japan

[15] Joint Inst Nucl Res, Dubna 141980, Russia

[16] Ist Nazl Fis Nucl, Sez Leccea, I-73100 Lecce, Italy

[17] Univ Lecce, Dipartimento Fisicab, I-73100 Lecce, Italy

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.107.171801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 mu(+) -> e(+)gamma. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8 x 10(14) muon decays, gives a 90% C. L. upper limit of 2.4 x 10(-12) on the branching ratio of the mu(+) -> e(+)gamma decay, constituting the most stringent limit on the existence of this decay to date.

引用

页数：5

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