Spin Dependence of η Meson Production in Proton-Proton Collisions Close to Threshold

被引：2

作者：

Adlarson, P. ^{[1
,29
]}

Augustyniak, W. ^{[2
]}

Bardan, W. ^{[3
]}

Bashkanov, M. ^{[4
]}

Bass, S. D. ^{[3
]}

Bergmann, F. S. ^{[5
]}

Berlowski, M. ^{[6
]}

Bondar, A. ^{[7
,8
]}

Buscher, M. ^{[9
,30
,31
]}

Calen, H. ^{[1
]}

Ciepal, I. ^{[10
]}

Clement, H. ^{[11
,12
]}

Czerwinski, E. ^{[3
]}

Demmich, K. ^{[5
]}

Engels, R. ^{[9
]}

Erven, A.

Erven, W. ^{[13
]}

Eyrich, W. ^{[14
]}

Fedorets, P. ^{[9
,15
]}

Fohl, K. ^{[16
]}

Fransson, K. ^{[1
]}

Goldenbaum, F. ^{[9
]}

Goswami, A. ^{[9
,17
]}

Grigoryev, K. ^{[9
,18
]}

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

Heijkenskjold, L. ^{[1
,29
]}

Hejny, V. ^{[9
]}

Husken, N. ^{[5
]}

Jarczyk, L. ^{[3
]}

Johansson, T. ^{[1
]}

Kamys, B. ^{[3
]}

Kemmerling, G. ^{[13
]}

Khatri, G. ^{[3
,33
]}

Khoukaz, A. ^{[5
]}

Khreptak, O. ^{[3
]}

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

Kistryn, S. ^{[3
]}

Kleines, H. ^{[32
]}

Klos, B. ^{[20
]}

Krzemien, W. ^{[3
]}

Kulessa, P. ^{[10
]}

Kupsc, A. ^{[1
,6
]}

Kuzmin, A. ^{[7
]}

Lalwani, K. ^{[21
]}

Lersch, D. ^{[9
]}

Lorentz, B. ^{[9
]}

Magiera, A. ^{[3
]}

Maier, R. ^{[9
,22
,23
]}

Marciniewski, P. ^{[1
]}

Marianski, B.

机构：

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

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

[3] Jagiellonian Univ, Inst Phys, Prof Stanislawa Lojasiewicza 11, PL-30348 Krakow, Poland

[4] Univ Edinburgh, Sch Phys & Astron, James Clerk Maxwell Bldg,Peter Guthrie Tait Rd, Edinburgh EH9 3FD, Midlothian, Scotland

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

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

[7] SB RAS, Budker Inst Nucl Phys, 11 Aka Lavrentieva Prospect, Novosibirsk 630090, Russia

[8] Novosibirsk State Univ, 2 Pirogova Str, Novosibirsk 630090, Russia

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

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

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

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

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

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

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

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

[17] Indian Inst Technol Indore, Dept Phys, Indore 453552, Madhya Pradesh, India

[18] Petersburg Nucl Phys Inst, High Energy Phys Div, Orlova Rosha 2, Gatchina, 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] Malaviya Natl Inst Technol Jaipur, Dept Phys, JLN Marg, Jaipur 302017, Rajasthan, India

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

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

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

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

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

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

[28] Natl Ctr Nucl Res, Dept Astrophys, PL-90950 Lodz, Poland

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

[30] Forschungszentrum Julich, PGI Elekt Eigensch 6, Peter Grunberg Inst, D-52425 Julich, Germany

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

[32] Forschungszentrum Julich, Julich Ctr Neutron Sci JCNS, D-52425 Julich, Germany

[33] Harvard Univ, Dept Phys, 17 Oxford St, Cambridge, MA 02138 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 02期

基金：

瑞典研究理事会;

关键词：

QUASI-FREE; NUCLEON; FACILITY; COSY;

D O I：

10.1103/PhysRevLett.120.022002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high polarization degree of the proton beam of COSY, the reaction (p) over right arrowp -> pp eta has been measured close to threshold to explore the analyzing power A(y). The angular distribution of A(y) is determined with the precision improved by more than 1 order of magnitude with respect to previous results, allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q = 15 MeV, signaling s-wave production with no evidence for higher partial waves. At Q = 72 MeV the data reveal strong interference of Ps and Pp partial waves and cancellation of (Pp)(2) and Ss*Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the eta meson.

引用

页数：6

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