Exclusive measurement of the eta -> pi(+) pi(-) gamma decay

doi:10.1016/j.physletb.2011.12.027

	Exclusive measurement of the eta -> pi(+) pi(-) gamma decay
	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
刊名	PHYSICS LETTERS B
	2012-01-20
卷号	707 页码:243-249
关键词	Eta Meson Box Anomaly Exclusive Measurement
ISSN号	0370-2693
DOI	10.1016/j.physletb.2011.12.027
文献子类	Article
英文摘要	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.
资助项目	Polish Ministry of Science and Higher Education[PBS 7P-P6-2/07]
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000300134400002
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/49117]
专题	中国科学院近代物理研究所
通讯作者	Redmer, C. F.
作者单位	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
推荐引用方式 GB/T 7714	Adlarson, P.,Adolph, C.,Augustyniak, W.,et al. Exclusive measurement of the eta -> pi(+) pi(-) gamma decay[J]. PHYSICS LETTERS B,2012,707:243-249.
APA	Adlarson, P..,Adolph, C..,Augustyniak, W..,Bardan, W..,Bashkanov, M..,...&WASA-At-COSY Collaboration.(2012).Exclusive measurement of the eta -> pi(+) pi(-) gamma decay.PHYSICS LETTERS B,707,243-249.
MLA	Adlarson, P.,et al."Exclusive measurement of the eta -> pi(+) pi(-) gamma decay".PHYSICS LETTERS B 707(2012):243-249.