Energy-independent PWA of the reaction $\gamma p\to K^+\Lambda$
  Using all recent data on the differential cross sections and spin observables for the reaction $\gamma p \to K^+ \Lambda$, an energy-independent partial-wave analysis is performed. The analysis requires multipoles up to $L = 2$; there is no evidence that the fit requires multipoles with $L=3$. At present the available data allow us to extract the dominant multipoles only. These are compatible with the multipoles obtained in the energy-dependent fit. This result supports the reliability of the Bonn-Gatchina energy-dependent results. 
A.V. Anisovich, R. Beck, V. Burkert, E. Klempt, M.E. McCracken, V.A.   Nikonov, A.V. Sarantsev, R.A. Schumacher, U. Thoma
nucl-ex nucl-th