@inproceedings{386ccc85a9e940a2b33bc31ff606dcb5,
title = "Two-pion production in the Delta Delta region: Is the ABC-effect the result of a resonance in the pn Delta Delta system?",
abstract = "The ABC effect - a puzzling low-mass enhancement in the pi pi invariant mass spectrum - is known from inclusive measurements of two-pion production in nuclear fusion reactions. Exclusive measurements conducted at CELSIUS-WASA for the fusion reactions leading to d and He-3 in the final state reveal the ABC effect to be of scalar-isoscalar nature and to be associated with the formation of a resonance in the pn Delta Delta systems in the intermediate state. The differential distributions for the pi(0)pi(0) channels can be well described, if a quasi-bound state within the AA system is assumed, which gives rise to a resonance structure in the total cross section. This ansatz is capable of describing all differential cross sections including the results of previous inclusive measurements on He-4 as well as the energy dependence of the total cross sections.",
keywords = "ABC effect, Delta Delta resonance, GEV-C, MODEL",
author = "{CELSIUS-WASA Collaboration} and M. Bashkanov and H. Clement and O. Khakimova and F. Kren and A. Pricking and T. Skorodko and Wagner, {G. J.}",
year = "2007",
month = jan,
day = "1",
language = "English",
isbn = "978-0-7354-0464-9",
series = "AIP CONFERENCE PROCEEDINGS",
publisher = "AMER INST PHYSICS",
pages = "256--258",
editor = "A Kupsc and P Moskal and M Wolke",
booktitle = "MESON PHYSICS AT COSY - 11 AND WASA-AT- COSY",
note = "International Symposium on Meson Physics at COSY-11 and WASA-AT-COSY ; Conference date: 17-06-2007 Through 22-06-2007",
}