Spin density matrix of the in the reaction - Crystal Barrel Collaboration C. Amsler, F. H. Heinsius, H. Koch, B. Kopf, U. Kurilla, C. A. Meyer, K. Peters, J. Pychy, M. Steinke and U. Wiedner Eur. Phys. J. C, 75 3 (2015) 124 Published online: 17 March 2015 DOI: 10.1140/epjc/s10052-015-3341-9