Exclusive measurement of the pp→p pπ+π- reaction near threshold -: art. no. 192301

被引：74

作者：

Brodowski, W

Bilger, R

Calén, H

Clement, H

Ekström, C

Fransson, K

Greiff, J

Häggström, S

Höistad, B

Johanson, J

Johansson, A

Johansson, T

Kilian, K

Kullander, S

Kupsc, A

Marciniewski, P

Morosov, B

Oelert, W

Pätzold, J

Ruber, RJMY

Schepkin, M

Scobel, W

Seluzhenkov, I

Stepaniak, J

Sukhanov, A

Turowiecki, A

Wagner, GJ

Wilhelmi, Z

Zabierowski, J

Zlomanczuk, J

机构：

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

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

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

[4] Univ Hamburg, Inst Expt Phys 1, Hamburg, Germany

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

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

[7] Inst Theoret & Expt Phys, Moscow 117218, Russia

[8] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland

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

[10] Soltan Inst Nucl Studies, PL-90137 Lodz, Poland

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.88.192301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The pp --> pppi(+)pi(-) reaction has been measured exclusively near threshold at CELSIUS. The total cross sections are nearly an order of magnitude lower than expected from previous inclusive measurements. The differential cross sections reveal pp --> pp(*)(1440)--> ppsigma = pp(pi(+)pi(-)) (I=l=0) as the dominant process as well as significant contributions from p(*) --> Delta(++)pi(-) --> psigma . The observed anisotropy in the proton angular dependence is consistent with heavy-meson exchange. In the invariant mass spectra, no narrow structures of statistical relevance (3sigma) are found.

引用

页码：4 / 192301

页数：4

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