Search for a dark photon in the π0 → e+e-γ decay

被引：108

作者：

Adlarson, P. ^{[1
]}

Augustyniak, W. ^{[2
]}

Bardan, W. ^{[3
]}

Bashkanov, M. ^{[4
,5
]}

Bergmann, F. S. ^{[6
]}

Berlowski, M. ^{[7
]}

Bhatt, H. ^{[8
]}

Bondar, A. ^{[9
]}

Buescher, M. ^{[10
,11
]}

Calen, H. ^{[1
]}

Ciepal, I. ^{[3
]}

Clement, H. ^{[4
,5
]}

Coderre, D. ^{[10
,11
,12
]}

Czerwinski, E. ^{[3
]}

Demmich, K. ^{[6
]}

Doroshkevich, E. ^{[4
,5
]}

Engels, R. ^{[10
,11
]}

Erven, W. ^{[11
,13
]}

Eyrich, W. ^{[14
]}

Fedorets, P. ^{[10
,11
,15
]}

Foehl, K. ^{[16
]}

Fransson, K. ^{[1
]}

Goldenbaum, E. ^{[10
,11
]}

Goslawski, P. ^{[6
]}

Goswami, A. ^{[17
]}

Grigoryev, K. ^{[10
,11
,18
]}

Gullstrom, C. -O. ^{[1
]}

Hauenstein, F. ^{[14
]}

Heijkenskjold, L. ^{[1
]}

Hejny, V. ^{[10
,11
]}

Hinterberger, F. ^{[19
]}

Hodana, M. ^{[3
,10
,11
]}

Hoistad, B. ^{[1
]}

Jany, A. ^{[3
]}

Jany, B. R. ^{[3
]}

Jarczyk, L. ^{[3
]}

Johansson, T. ^{[1
]}

Kamys, B. ^{[3
]}

Kemmerling, G. ^{[11
,13
]}

Khan, F. A. ^{[10
,11
]}

Khoukaz, A. ^{[6
]}

Kistryn, S. ^{[3
]}

Klaja, J. ^{[3
]}

Kleines, H. ^{[11
,13
]}

Kirillov, D. A. ^{[20
]}

Klos, B. ^{[21
]}

Krapp, M. ^{[14
]}

Krzemien, W. ^{[3
]}

Kulessa, P. ^{[22
]}

Kupsc, A. ^{[1
,7
]}

机构：

[1] Uppsala Univ, Div Nucl Phys, Dept Phys & Astron, S-75120 Uppsala, Sweden

[2] Natl Ctr Nucl Res, Dept Nucl Phys, PL-00681 Warsaw, Poland

[3] Jagiellonian Univ, Inst Phys, PL-30059 Krakow, Poland

[4] Univ Tubingen, Inst Phys, D-72076 Tubingen, Germany

[5] Univ Tubingen, Kepler Ctr Astro & Particle Phys, D-72076 Tubingen, Germany

[6] Univ Munster, Inst Kernphys, D-48149 Munster, Germany

[7] Natl Ctr Nucl Res, Dept High Energy Phys, PL-00681 Warsaw, Poland

[8] Indian Inst Technol, Dept Phys, Bombay 400076, Maharashtra, India

[9] Budker Inst Nucl Phys SB RAS, Novosibirsk 630090, Russia

[10] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany

[11] Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany

[12] Ruhr Univ Bochum, Inst Expt Phys 1, D-44780 Bochum, Germany

[13] Forschungszentrum Julich, Zent Inst Engn Elekt & Analyt, D-52425 Julich, Germany

[14] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany

[15] State Sci Ctr Russian Federat, Inst Theoret & Expt Phys, Moscow 117218, Russia

[16] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany

[17] Indian Inst Technol Indore, Dept Phys, Indore 452017, Madhya Pradesh, India

[18] Petersburg Nucl Phys Inst, Div High Energy Phys, Gatchina 188300, Russia

[19] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[20] Joint Inst Nucl Res, Veksler & Baldin Lab High Energy Phys, Dubna 141980, Moscow Region, Russia

[21] Univ Silesia, August Chelkowski Inst Phys, PL-40007 Katowice, Poland

[22] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[23] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany

[24] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

[25] Joint Inst Nucl Phys, Dzhelepov Lab Nucl Problems, Dubna 141980, Moscow Region, Russia

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

[27] Natl Ctr Nucl Res, Dept Cosm Ray Phys, PL-90950 Lodz, Poland

来源：

PHYSICS LETTERS B | 2013年 / 726卷 / 1-3期

基金：

瑞典研究理事会;

关键词：

Dark forces; Gauge vector boson; VECTOR GAUGE BOSON; PHI-MESON DECAYS; ENERGIES;

D O I：

10.1016/j.physletb.2013.08.055

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The presently world largest data sample for pi(0) -> gamma e(+)e(-) decays studies containing nearly 5 x 10(5) events was collected using the WASA detector at COSY. A search for a dark photon U produced in the pi(0) -> gamma U -> gamma e(+)e(-) decay from the pp -> pp pi(0) reaction was carried out. An upper limit on the square of the U -> gamma mixing strength parameter epsilon(2) of 5 x 10(-6) at 90% CL was obtained for the mass range 20 MeV < M-U < 100 MeV. This result together with other recent experimental limits significantly reduces the M-U vs. epsilon(2) parameter space which could explain the presently seen deviation between the Standard Model prediction and the direct measurement of the anomalous magnetic moment of the muon. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：187 / 193

页数：7

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