DOI 10.1007/s100529900180
Intermittency and correlations in hadronic Z0 decays
The OPAL Collaboration
G.Abbiendi2 - et al.
2 Dipartimento di Fisica dell' Università di Bologna and INFN,
I-40126 Bologna, Italy
Received: 8 February 1999 / Published online: 8 September 1999
Abstract
A multidimensional study of local multiplicity fluctuationsand
multiparticle correlationsof hadrons produced in Z0 decays is
performed. The study is based on the data sample of more than
events recorded with
the OPAL detector at LEP. The fluctuationsand correlationsare analysed in
terms of the normalized scaled factorial momentsand cumulantsup to the fifth
order.
The momentsare observed to have intermittency-like behaviour,
which is found to be more pronounced with increasing dimension. The
large data sample allows for the first time a study of the factorial
cumulantsin e+e-annihilation.
The analysis of the cumulantsshows the existence of genuine multiparticle
correlationswith a strong intermittencyrise up to higher orders.
These correlationsare found to be stronger in higher dimensions.
The decomposition of the factorial momentsinto lower-order
correlationsshows that the dynamical fluctuationshave important contributions from
genuinemany-particle correlations.
The Monte Carlomodels JETSET7.4 and HERWIG5.9 are found to
reproduce the trend of the measured moments and cumulants
but they underestimate the
magnitudes. The results are found to be consistent
with QCD jet formation dynamics, although additional
contributions from other mechanisms cannot be
excluded.
Copyright Springer-Verlag
