Intermittency and Correlations in Hadronic Z Decays

Abstract

A multidimensional study of local multiplicity fluctuations and multiparticle correlations of hadrons produced in Z decays is performed. The study is based on the data sample of more than 4 million events recorded with the OPAL detector at LEP. The fluctuations and correlations are analysed in terms of the normalized scaled factorial moments and cumulants up to the fifth order. The moments are 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 cumulants in e+e- annihilation. The analysis of the cumulants shows the existence of genuine multiparticle correlations with a strong intermittency rise up to higher orders. These correlations are found to be stronger in higher dimensions. The decomposition of the factorial moments into lower-order correlations shows that the dynamical fluctuations have important contributions from genuine many-particle correlations. The Monte Carlo models JETSET 7.4 and HERWIG 5.9 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 in the hadronization process cannot be excluded.

28 pages, LaTeX, 12 ps figures included, submitted to European Physical Journal C

Cited by in corpus (15)

• Properties and uses of factorial cumulants in relativistic heavy-ion collisions
• Prospects of searching for (un)particles from Hidden Sectors using rapidity correlations in multiparticle production at the LHC
• The effect of many sources on the genuine multiparticle correlations
• Investigation of Colour Reconnection in WW Events with the DELPHI detector at LEP-2
• The many sources effect on the genuine multihadron correlations
• Charged Hadron Multiplicity Distribution at Relativistic Heavy Ion Colliders
• Weibull Distribution and the multiplicity moments in $pp(p\bar{p})$ collisions
• QCD coherence and correlations of particles with restricted momenta in hadronic Z decays
• Searching for hidden sector in multiparticle production at the LHC
• A comparison of different methods in the study of dynamical fluctuations in high energy e+e- collisions
• Study on Fractal Characteristics in the e${}^{+}$e${}^{-}$ Collisions at $\sqrt{s_{NN}}=250$GeV
• Three-particle correlations in QCD jets and beyond
• Multiplicities, fluctuations and correlations
• Multiparticle production and perturbative QCD
• Suppression of multi-gluon fluctuations in jets at a Linear Collider