Exclusive measurement of the η → π+ π- γ decay

被引：32

作者：

Adlarson, P. ^{[1
]}

Adolph, C. ^{[2
]}

Augustyniak, W. ^{[3
]}

Bardan, W. ^{[4
,5
,6
]}

Bashkanov, M. ^{[7
]}

Bednarski, T. ^{[4
]}

Bergmann, F. S. ^{[8
]}

Berlowski, M. ^{[9
]}

Bhatt, H. ^{[10
]}

Brinkmann, K. -T. ^{[11
]}

Buescher, M. ^{[5
,6
]}

Calen, H. ^{[1
]}

Clement, H. ^{[7
]}

Coderre, D. ^{[5
,6
,12
]}

Czerwinski, E. ^{[4
]}

Doroshkevich, E. ^{[7
]}

Engels, R. ^{[5
,6
]}

Erven, W. ^{[6
,13
]}

Eyrich, W. ^{[2
]}

Fedorets, P. ^{[14
]}

Foehl, K. ^{[15
]}

Fransson, K. ^{[1
]}

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

Goslawski, P. ^{[8
]}

Grigoryev, K. ^{[5
,6
,16
]}

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

Hanhart, C. ^{[5
,6
,17
]}

Heijkenskjold, L. ^{[1
]}

Heimlich, J. ^{[2
]}

Hejny, V. ^{[5
,6
]}

Hinterberger, F. ^{[11
]}

Hodana, M. ^{[4
,5
,6
]}

Hoistad, B. ^{[1
]}

Jacewicz, M. ^{[1
]}

Jany, A. ^{[4
]}

Jany, B. R. ^{[4
]}

Jarczyk, L. ^{[4
]}

Johansson, T. ^{[1
]}

Kamys, B. ^{[4
]}

Kemmerling, G. ^{[6
,13
]}

Khakimova, O. ^{[7
]}

Khoukaz, A. ^{[8
]}

Kistryn, S. ^{[4
]}

Klaja, J. ^{[4
,5
,6
]}

Kleines, H. ^{[6
,13
]}

Klos, B. ^{[18
]}

Kren, F. ^{[7
]}

Krzemien, W. ^{[4
]}

Kulessa, P. ^{[19
]}

Kupsc, A. ^{[1
]}

机构：

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

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

[3] Andrzej Soltan Inst Nucl Studies, Dept Nucl React, PL-00681 Warsaw, Poland

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

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

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

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

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

[9] Andrzej Soltan Inst Nucl Studies, Dept High Energy Phys, PL-00681 Warsaw, Poland

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

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

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

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

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

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

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

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

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

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

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

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

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

[23] Joint Inst Nucl Res, Dzhelepov Lab Nucl Problems, Dubna 141980, Russia

[24] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China

[25] Andrzej Soltan Inst Nucl Studies, Dept Cosm Ray Phys, PL-90950 Lodz, Poland

来源：

PHYSICS LETTERS B | 2012年 / 707卷 / 02期

基金：

瑞典研究理事会;

关键词：

eta meson; Box anomaly; Exclusive measurement;

D O I：

10.1016/j.physletb.2011.12.027

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An exclusive measurement of the decay eta -> pi(+) pi(-) gamma has been performed at the WASA facility at COSY. The eta mesons were produced in the fusion reaction pd -> He-3 X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13 960 +/- 140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of eta -> pi(+) pi(-) gamma. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the pi(+) pi(-) system. (C) 2011 Elsevier B.V All rights reserved.

引用

页码：243 / 249

页数：7

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