Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2011-02-24
Physics
Nuclear Physics
Nuclear Theory
12 pages, 8 figures
Scientific paper
Model dependence of multipole analysis has been explored through energy-dependent and single-energy fits to pion photoproduction data. The MAID energy-dependent solution has been used as input for an event generator producing realistic pseudo data. These were fitted using the SAID parametrization approach to determine single-energy and energy-dependent solutions over a range of lab photon energies from 200 to 1200 MeV. The resulting solutions were found to be consistent with the input amplitudes from MAID. Fits with a $\chi$-squared per datum of unity or less were generally achieved. We discuss energy regions where consistent results are expected, and explore the sensitivity of fits to the number of included single- and double-polarization observables. The influence of Watson's theorem is examined in detail.
Briscoe William J.
Kamalov Sabit S.
Ostrick Michael
Paris Mark W.
Schumann Sven
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