Speaker
Description
Single-energy partial wave analysis has often been applied as a way to fit data with minimal model dependence. However, remaining unconstrained, partial waves at neighboring energies will vary discontinuously because the overall amplitude phase cannot be determined through single-channel measurement. This problem can be mitigated with the use of a constraining penalty function based on an associated energy-dependent fit. However, the weight given to this constraint results in a biased fit to the data. In this paper, for the first time, a constraining function which does not influence the fit to data is explored. The constraint comes from the overall phase found in multi-channel fits which, in the present study, are the Bonn-Gatchina and Juelich-Bonn multi-channel analyses. The data are well reproduced and weighting of the penalty function does not influence the result. The method is applied to KΛ photoproduction data and all observables can be maximally well reproduced. While the employed multi-channel analyses display very different multipole amplitudes, we show how this can be related to the overall phase.
