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
interactions give origin to nonzero values of the
off-diagonal element
of the helicity density matrix of vector
mesons produced in e+ e- annihilations, as has been confirmed by recent OPAL
data on
,
D*, and K*. New predictions are given for
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.
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