Off-diagonal helicity density matrix elements for vector mesons produced in polarized e+e- processes M. Anselmino, M. Bertini, F. Caruso, F. Murgia and P. Quintairos Eur. Phys. J. C, 11 3 (1999) 529-537 Published online: 22 October 1999 DOI: 10.1007/s100529900200