A study of spin alignment of
in hadronic Z0 decays
The OPAL Collaboration
G. Abbiendi 2 - et al.
2Dipartimento di Fisica dell' Università di Bologna and INFN,
40126 Bologna, Italy
Received: 14 June 1999 / Published online: 8 May 2000 - © Springer-Verlag 2000
The helicity density matrix elements of and mesons produced in Z0 decays have been measured using the OPAL detector at LEP. Over the measured meson energy range, the values are compatible with 1/3, corresponding to a statistical mix of helicity -1, 0 and +1 states. For the highest accessible scaled energy range 0.3 < xE < 0.6, the measured values of the and the are 0.373 0.052 and 0.142 0.114, respectively. These results are compared to measurements of other vector mesons.
Copyright Società Italiana di Fisica, Springer-Verlag 2000