Higher partial waves in pp → ppη near threshold

被引：55

作者：

Calén, H

Dyring, J

Fäldt, G

Fransson, K

Gustafsson, L

Häggström, S

Höistad, B

Johanson, J

Johansson, A

Johansson, T

Kullander, S

Mörtsell, A

Ruber, R

Zlomanczuk, J

Ekström, C

Kilian, K

Oelert, W

Sefzick, T

Bilger, R

Brodowski, W

Clement, H

Wagner, GJ

Bondar, A

Kuzmin, A

Schwartz, B

Sidorov, V

Sukhanov, A

Dunin, V

Morosov, B

Povtorejko, A

Sukhanov, A

Zernov, A

Kupsc, A

Marciniewski, P

Stepaniak, J

Zabierowski, J

Turowiecki, A

Wilhelmi, Z

Wilkin, C

机构：

[1] Uppsala Univ, Dept Radiat Sci, S-75121 Uppsala, Sweden

[2] Svedberg Lab, S-75121 Uppsala, Sweden

[3] Forschungszentrum Julich, IKP, D-52425 Julich, Germany

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

[5] Novosibirsk Nucl Phys Inst, Novosibirsk 630090, Russia

[6] Joint Inst Nucl Res, Dubna 101000, Russia

[7] Inst Nucl Studies, PL-00681 Warsaw, Poland

[8] Inst Nucl Studies, PL-90137 Lodz, Poland

[9] Warsaw Univ, Inst Expt Phys, PL-0061 Warsaw, Poland

[10] Univ London Univ Coll, Dept Phys & Astron, London WC1E 6BT, England

来源：

PHYSICS LETTERS B | 1999年 / 458卷 / 2-3期

关键词：

eta-mesons; threshold production; angular distribution;

D O I：

10.1016/S0370-2693(99)00613-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Exclusive measurements of the production of eta-mesons in the pp-->pp eta reaction have been carried out at excess energies of 16 and 37 MeV above threshold. The deviations from phase space are dominated by the proton-proton final state interaction and this influences particularly the energy distribution of the eta-meson. However, evidence is also presented at the higher energy for the existence of an anisotropy in the angular distributions of the eta-meson and also of the final proton-proton pair, probably to be associated with D-waves in this system interfering with the dominant S-wave term. The sign of the eta angular anisotropy suggests that rho-exchange is important for this reaction. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：190 / 196

页数：7

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