https://doi.org/10.1140/epja/i2007-10490-6
Regular Article - Theoretical Physics
Unitary isobar model --MAID2007
1
Institut für Kernphysik, Universität Mainz, D-55099, Mainz, Germany
2
JINR Dubna, 141980, Moscow Region, Russia
* e-mail: tiator@kph.uni-mainz.de
Received:
4
October
2007
Accepted:
8
October
2007
Published online:
22
October
2007
The unitary isobar model MAID2007 has been developed to analyze the world data of pion photo- and electroproduction. The model contains both a common background and several resonance terms. The background is unitarized according to the K -matrix prescription, and the 13 four-star resonances with masses below 2GeV are described by appropriately unitarized Breit-Wigner forms. The data have been analyzed by both single-energy and global fits, and the transverse and longitudinal helicity amplitudes have been extracted for the four-star resonances below 2GeV. Because of its inherent simplicity, MAID2007 is well adopted for predictions and analysis of the observables in pion photo- and electroproduction.
PACS: 11.80.Et Partial-wave analysis – / 13.40.-f Electromagnetic processes and properties – / 13.60.Le Meson production – / 14.20.Gk Baryon resonances with S = 0 –
© Società Italiana di Fisica and Springer-Verlag, 2007
