DOI 10.1007/s100520000388
A study of spin alignment of
and
mesons
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
Abstract
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