Influence of spin-rotation measurements on partial-wave analyses of   elastic pion-nucleon scattering
  Recent measurements of spin-rotation parameters in elastic $\pi^+ p$ scattering are in marked disagreement with predictions of the Carnegie-Mellon$-$Berkeley and Karlsruhe-Helsinki analyses. Using the method of Barrelet, we show how this discrepancy can be removed. We then show how this Barrelet transformation alters the partial-wave amplitudes. The effect of unitarity and analyticity constraints is also considered. 
I. G. Alekseev, V. P. Kanavets, B. V. Morozov, D. N. Svirida, S. P.   Kruglov, A. A. Kulbardis, V. V. Sumachev, R. A. Arndt,...