Measurements of branching ratios for η decays into charged particles

被引：0

作者：

Adlarson, P. ^{[1
,27
]}

Augustyniak, W. ^{[2
]}

Bardan, W. ^{[3
]}

Bashkanov, M. ^{[4
,5
,28
]}

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

Berlowski, M. ^{[7
]}

Bhatt, H. ^{[8
]}

Bondar, A. ^{[9
,10
]}

Buescher, M. ^{[11
,29
,30
]}

Calen, H. ^{[1
]}

Ciepal, I. ^{[3
]}

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

Coderre, D. ^{[11
,12
,31
]}

Czerwinski, E. ^{[3
]}

Demmich, K. ^{[6
]}

Engels, R. ^{[11
]}

Erven, A. ^{[13
]}

Erven, W. ^{[13
]}

Eyrich, W. ^{[14
]}

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

Foehl, K. ^{[16
]}

Fransson, K. ^{[1
]}

Goldenbaum, F. ^{[11
]}

Goswami, A. ^{[11
,17
]}

Grigoryev, K. ^{[11
,18
,32
]}

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

Heijkenskjold, L. ^{[1
]}

Hejny, V. ^{[11
]}

Huesken, N. ^{[6
]}

Jarczyk, L. ^{[3
]}

Johansson, T. ^{[1
]}

Kamys, B. ^{[3
]}

Kemmerling, G. ^{[13
]}

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

Khatri, G. ^{[3
]}

Khoukaz, A. ^{[6
]}

Kirillov, D. A. ^{[19
]}

Kistryn, S. ^{[3
]}

Kleines, H. ^{[13
]}

Klos, B. ^{[20
]}

Krzemien, W. ^{[3
]}

Kulessa, P. ^{[21
]}

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

Kuzmin, A. ^{[9
,10
]}

Lalwani, K. ^{[8
,33
]}

Lersch, D. ^{[11
]}

Lorentz, B. ^{[11
]}

Magiera, A. ^{[3
]}

Maier, R. ^{[11
,22
,23
]}

Marciniewski, P. ^{[1
]}

机构：

[1] Uppsala Univ, Div Nucl Phys, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden

[2] Natl Ctr Nucl Res, Dept Nucl Phys, Ul Hoza 69, PL-00681 Warsaw, Poland

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

[4] Eberhard Karls Univ Tubingen, Inst Phys, Morgenstelle 14, D-72076 Tubingen, Germany

[5] Univ Tubingen, Inst Phys, Kepler Ctr Astro & Teilchenphys, Morgenstelle 14, D-72076 Tubingen, Germany

[6] Westfal Wilhelms Univ Munster, Inst Kernphys, Wilhelm Klemm Str 9, D-48149 Munster, Germany

[7] Natl Ctr Nucl Res, Dept High Energy Phys, Ul Hoza 69, PL-00681 Warsaw, Poland

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

[9] Budker Inst Nucl Phys SB RAS, 11 Akad Lavrentieva Prospect, Novosibirsk 630090, Russia

[10] Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia

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

[12] Ruhr Univ Bochum, Inst Expt Phys 1, Univ Str 150, D-44780 Bochum, Germany

[13] Forschungszentrum Julich, Zentralinst Engn Elektron & Anal, D-52425 Julich, Germany

[14] Friedrich Alexander Univ Erlangen Nurnberg, Inst Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany

[15] State Sci Ctr Russian Federat, Inst Theoret & Expt Phys, 25 Bolshaya Cheremushkinskaya, Moscow 117218, Russia

[16] Justus Liebig Univ Giessen, Inst Phys 2, Heinrich Buff Ring 16, D-35392 Giessen, Germany

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

[18] Petersburg Nucl Phys Inst, Div High Energy Phys, 2 Orlova Rosha, Gatchina 188300, Leningrad Distr, Russia

[19] Joint Inst Nucl Phys, Veksler & Baldin Lab High Energiy Phys, 6 Joliot Curie, Dubna 141980, Russia

[20] Univ Silesia, August Chelkowski Inst Phys, Uniwersytecka 4, PL-40007 Katowice, Poland

[21] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, 152 Radzikowskiego St, PL-31342 Krakow, Poland

[22] Forschungszentrum Julich, Julich Aachen Res Alliance, JARA FAME, D-52425 Julich, Germany

[23] Rhein Westfal TH Aachen, D-52056 Aachen, Germany

[24] Tomsk State Univ, Dept Phys, 36 Lenina Ave, Tomsk 634050, Russia

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

[26] Natl Ctr Nucl Res, Dept Astrophys, Ul Box 447, PL-90950 Lodz, Poland

[27] Johannes Gutenberg Univ Mainz, Inst Kernphys, Johann Joachim Becher Weg 45, D-55128 Mainz, Germany

[28] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3FD, Midlothian, Scotland

[29] Forschungszentrum Julich, Peter Grunberg Inst, Elekt Eigenschaften PGI 6, D-52425 Julich, Germany

[30] Heinrich Heine Univ Dusseldorf, Inst Laser & Plasmaphys, Univ Str 1, D-40225 Dusseldorf, Germany

[31] Univ Bern, Albert Einstein Ctr Fundamental Phys, Sidlerstr 5, CH-3012 Bern, Switzerland

[32] Rhein Westfal TH Aachen, Phys Inst B 3, Phys Zentrum, D-52056 Aachen, Germany

[33] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India

[34] Ist Nazl Fis Nucl, Lab Nazl Frascati, Via E Fermi 40, I-00044 Rome, Italy

来源：

PHYSICAL REVIEW C | 2016年 / 94卷 / 06期

基金：

瑞典研究理事会; 欧盟第七框架计划;

关键词：

TRANSITION FORM-FACTORS; CONVERSION DECAYS; DETECTOR; GAMMA; MU(+)MU(-)GAMMA; OMEGA; NA60;

D O I：

10.1103/physRevC.94.065206

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The WASA-at-COSY experiment has collected 3 x 10(7) events with eta mesons produced via the reaction pd -> He-3 eta at T = 1.0 GeV. Using this data set, we evaluate the branching ratios of the decays eta -> pi(+)pi(-)gamma, eta -> e(+)e(-)gamma, eta -> pi(+)pi(-)e(+)e(-), and eta -> e(+)e(-)e(+)e(-). The branching ratios are normalized to the eta -> pi(+)pi(-) pi(0) decay. In addition an upper limit on a CP-violating asymmetry in eta -> pi(+)pi(-)e(+)e(-) is extracted.

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页数：13

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