@inproceedings{739cb9a0701f4ed4b71b76116e1f145c,
title = "Study of Few-Body Problems at WASA - the ABC Phenomenon",
abstract = "A short overview over the ongoing few-body program at WASA@COSY is given with special emphasis on the ABC phenomenon, which is known since 50 years without having found a consistent explanation. We show that this phenomenon is linked with a resonant energy dependence in the total cross section of isoscalar double-pionic fusion processes. This resonance structure is connected with the baryon-baryon system, in particular with the pn and Delta Delta systems, however, possesses a mass, which is 90 MeV below the nominal Delta Delta threshold and has a width of only 50 MeV, i.e., five times smaller than expected from a conventional t-channel Delta Delta process.",
keywords = "DOUBLE-PION PRODUCTION, ROPER RESONANCE, GEV-C, NUCLEON COLLISIONS, 2-PION PRODUCTION, CROSS-SECTIONS, SINGLE-PION, S-WAVE, ENHANCEMENT, EXCITATION",
author = "{WASA-At-COSY Collaboration} and M. Bashkanov",
year = "2010",
month = apr,
day = "12",
doi = "10.1051/epjconf/20100303011",
language = "English",
series = "EPJ Web of Conferences",
publisher = "E D P SCIENCES",
editor = "E Eplelbaum and HW Hammer and UG Meibner",
booktitle = "19TH INTERNATIONAL IUPAP CONFERENCE ON FEW-BODY PROBLEMS IN PHYSICS",
note = "19th International IUPAP Conference on Few-Body Problems in Physics ; Conference date: 31-08-2009 Through 05-09-2009",
}