A search for μ+→e+ γ with the first dataset of the MEG II experiment

被引：0

作者：

Afanaciev, K. ^{[1
]}

Baldini, A. M. ^{[2
]}

Ban, S. ^{[4
]}

Baranov, V. ^{[1
]}

Benmansour, H. ^{[2
,3
]}

Biasotti, M. ^{[5
]}

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

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

Cavoto, G. ^{[9
,10
]}

Cei, F. ^{[2
,3
]}

Chiappini, M. ^{[2
,3
]}

Chiarello, G. ^{[11
,23
]}

Corvaglia, A. ^{[11
]}

Cuna, F. ^{[11
,12
,24
]}

Dal Maso, G. ^{[13
,14
]}

De Bari, A. ^{[7
]}

De Gerone, M. ^{[5
]}

Barusso, L. Ferrari ^{[5
,6
]}

Francesconi, M. ^{[15
]}

Galli, L. ^{[2
]}

Gallucci, G. ^{[5
]}

Gatti, F. ^{[5
,6
]}

Gerritzen, L. ^{[4
]}

Grancagnolo, F. ^{[11
]}

Grandoni, E. G. ^{[2
,3
]}

Grassi, M. ^{[2
]}

Grigoriev, D. N. ^{[16
,17
,18
]}

Hildebrandt, M. ^{[13
]}

Ieki, K. ^{[4
]}

Ignatov, F. ^{[19
]}

Ikeda, F. ^{[4
]}

Iwamoto, T. ^{[4
]}

Karpov, S. ^{[16
,18
]}

Kettle, P. -R. ^{[13
]}

Khomutov, N. ^{[1
]}

Kobayashi, S. ^{[4
]}

Kolesnikov, A. ^{[1
]}

Kravchuk, N. ^{[1
]}

Krylov, V. ^{[1
]}

Kuchinskiy, N. ^{[1
]}

Kyle, W. ^{[20
]}

Libeiro, T. ^{[20
]}

Malyshev, V. ^{[1
]}

Matsushita, A. ^{[4
]}

Meucci, M. ^{[9
,10
]}

Mihara, S. ^{[21
]}

Molzon, W. ^{[20
]}

Mori, Toshinori ^{[4
]}

Nakao, M. ^{[4
]}

Nicolo, D. ^{[2
,3
]}

机构：

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

[2] INFN, Sez Pisa, Pisa, Italy

[3] Univ Pisa, Dipartimento Fis, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[4] Univ Tokyo, ICEPP, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1130033, Japan

[5] INFN, Sez Genova, Genoa, Italy

[6] Univ Genoa, Dipartimento Fis, Via Dodecaneso 33, I-16146 Genoa, Italy

[7] INFN, Sez Pavia, Pavia, Italy

[8] Univ Pavia, Dipartimento Fis, Via Bassi 6, I-27100 Pavia, Italy

[9] INFN, Sez Roma, Rome, Italy

[10] Univ Sapienza, Dipartimento Fis, Piazzale A Moro, I-00185 Rome, Italy

[11] INFN, Sez Lecce, Lecce, Italy

[12] Univ Salento, Dipartimento Matemat & Fis, Via Arnesano, I-73100 Lecce, Italy

[13] Paul Scherrer Inst PSI, CH-5232 Villigen, Switzerland

[14] Inst Particle Phys & Astrophys, ETH Zurich, Otto Stern Weg 5, CH-8093 Zurich, Switzerland

[15] INFN, Sez Napoli, Via Cintia, I-80126 Naples, Italy

[16] Russian Acad Sci, Siberian Branch, Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[17] Novosibirsk State Tech Univ, Novosibirsk 630092, Russia

[18] Novosibirsk State Univ, Novosibirsk 630090, Russia

[19] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, England

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

[21] KEK High Energy Accelerator Res Org, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan

[22] Kobe Univ, 1-1 Rokkodai Cho,Nada Ku, Kobe, Hyogo 6578501, Japan

[23] Univ Palermo, Dept Engn, Viale Sci,Bldg 9, I-90128 Palermo, Italy

[24] INFN, Sez Bari, Via Giovanni Amendola 173, I-70126 Bari, Italy

[25] Univ LUM Giuseppe Degennaro, Dipartimento Med & Chirurg, I-70010 Bari, Italy

来源：

EUROPEAN PHYSICAL JOURNAL C | 2024年 / 84卷 / 03期

基金：

瑞士国家科学基金会;

关键词：

LEPTON FLAVOR-VIOLATION;

D O I：

10.1140/epjc/s10052-024-12416-2

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports the result of a search for the decay mu(+)-> e(+)gamma from data taken in the first physics run in 2021. No excess of events over the expected background is observed, yielding an upper limit on the branching ratio of B (mu(+)-> e(+)gamma) <7.5x10(-13) (90% CL). The combination of this result and the limit obtained by MEG gives B (mu(+)-> e(+)gamma) <3.1x10(-13) (90% CL), which is the most stringent limit to date. A ten-fold larger sample of data is being collected during the years 2022-2023, and data-taking will continue in the coming years.

引用

页数：10

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