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

共 50 条

[1] A search for μ+ → e+γ with the first dataset of the MEG II experiment (vol 84, 216, 2024)
Afanaciev, K.
Baldini, A. M.
Ban, S.
Baranov, V.
Benmansour, H.
Biasotti, M.
Boca, G.
Cattaneo, P. W.
Cavoto, G.
Cei, F.
Chiappini, M.
Chiarello, G.
Corvaglia, A.
Cuna, F.
Dal Maso, G.
De Bari, A.
De Gerone, M.
Barusso, L. Ferrari
Francesconi, M.
Galli, L.
Gallucci, G.
Gatti, F.
Gerritzen, L.
Grancagnolo, F.
Grandoni, E. G.
Grassi, M.
Grigoriev, D. N.
Hildebrandt, M.
Ieki, K.
Ignatov, F.
Ikeda, F.
Iwamoto, T.
Karpov, S.
Kettle, P. -r.
Khomutov, N.
Kobayashi, S.
Kolesnikov, A.
Kravchuk, N.
Krylov, V.
Kuchinskiy, N.
Kyle, W.
Libeiro, T.
Malyshev, V.
Matsushita, A.
Meucci, M.
Mihara, S.
Molzon, W.
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Nakao, M.
Nicolo, D.
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Chiri, C.
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Egger, J.
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Galli, L.
Gatti, F.
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[6] An FPGA-based trigger for the search of μ+ → e+γ decay in the MEG experiment
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The European Physical Journal C, 2013, 73
[9] The MEG detector for μ+ → e+γ decay search
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Cavoto, G.
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[10] An FPGA-based trigger system for the search of μ+ → e+ + γ decay in the MEG experiment
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