期刊
PHYSICS LETTERS B
卷 706, 期 4-5, 页码 256-262出版社
ELSEVIER
DOI: 10.1016/j.physletb.2011.11.041
关键词
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资金
- Forschungszentrum Julich including the COSY-FFE
- European Community
- German-BMBF
- German-Indian DAAD-DST
- VIQCD
- German Research Foundation (DFG)
- Wallenberg Foundation
- Swedish Research Council
- Goran Gustafsson Foundation
- Polish Ministry of Science and Higher Education
- Polish National Science Center
- Foundation for Polish Science - MPD
The reaction pp -> pp pi(0)pi(0) has been investigated at a beam energy of 1.4 GeV using the WASA-at-COSY facility. The total cross section is found to be (324 +/- 21(systematic) +/- 58(normalization)) mu b. In order to study the production mechanism, differential kinematic distributions have been evaluated. The differential distributions indicate that both initial state protons are excited into intermediate Delta(1232) resonances, each decaying into a proton and a single pion, thereby producing the pion pair in the final state. No significant contribution of the Roper resonance N*(1440) via its decay into a proton and two pions is found. (C) 2011 Elsevier B.V. All rights reserved.
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