2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 11, 529-537
DOI 10.1007/s100529900200

Off-diagonal helicity density matrix elements for vector mesons produced in polarized e+e- processes

M. Anselmino1 - M. Bertini2 - F. Caruso3,4 - F. Murgia5 - P. Quintairos6

1 Dipartimento di Fisica Teorica, Università di Torino and INFN, Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy
2 Theoretical Physics, Lund University, Sölvegatan 14a, 223 62 Lund, Sweden
3 Centro Brasileiro de Pesquisas Físicas, R. Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, Brazil
4 Instituto de Física da UERJ, Rua São Francisco Xavier 524, 20559-900 Rio de Janeiro, Brazil
5 INFN, Sezione di Cagliari and Dipartimento di Fisica, Università di Cagliari, C.P. 170, 09042 Monserrato (CA), Italy
6 Instituto de Física Teórica - UNESP, Rua Pamplona 145, 01405-900 São Paulo, Brazil

Received: 2 April 1999 / Revised version: 2 July 1999 / Published online: 22 October 1999

Abstract
Final-state $q\bar q$ interactions give origin to nonzero values of the off-diagonal element $\rho_{1,-1}$ of the helicity density matrix of vector mesons produced in e+ e- annihilations, as has been confirmed by recent OPAL data on $\phi$, D*, and K*. New predictions are given for $\rho_{1,-1}$of several mesons produced at large x/IE and small p/IT - i.e., collinear with the parent jet - in the annihilation of polarized e+and e-; the results depend strongly on the elementary dynamics and allow further nontrivial tests of the standard model.


Copyright Springer-Verlag