期刊
PHYSICS LETTERS B
卷 684, 期 2-3, 页码 110-113出版社
ELSEVIER
DOI: 10.1016/j.physletb.2009.12.061
关键词
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资金
- BMBF [06TU261]
- Forschungszentrum Julich (COSY-FFE)
- DFG [683]
- European Community [RII3-CT-2004-506078]
Exclusive measurements of the reaction pp -> d pi(+)pi(0) have been carried out at T-p = 1.1 GeV at the CELSIUS storage ring using the WASA detector. The isovector pi(+)pi(0) channel exhibits no enhancement at low invariant pi pi masses, i.e. no ABC effect. Therefore this most basic isovector double-pionic fusion reaction qualifies as an ideal test case for the conventional t-channel Delta Delta excitation process. Indeed, the obtained differential distributions reveal the conventional t-channel Delta Delta mechanism as the appropriate reaction process, which also accounts for the observed energy dependence of the total cross section. (C) 2010 Elsevier B.V. All rights reserved.
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