Article

Factorial and cumulant moments in e+e− → hadrons at the Z0 resonance

INFN Sezione di Pisa and Università di Pisa, I-56100 Pisa, Italy
Physics Letters B 03/1996; DOI: 10.1016/0370-2693(96)00046-9

ABSTRACT We present the first experimental study of the ratio of cumulant to factorial moments of the charged-particle multiplicity distribution in high-energy particle interactions, using hadronic Z0 decays collected by the SLD experiment at SLAC. We find that this ratio, as a function of the moment-rank q, decreases sharply to a negative minimum at q = 5, which is followed by quasi-oscillations. These features are insensitive to experimental systematic effects and are in qualitative agreement with expectations from next-to-next-to-leading-order perturbative QCD.

0 Bookmarks
 · 
112 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper contains a review of the main results of a search of regularities in collective variables properties in multiparticle dynamics, regularities which can be considered as manifestations of the original simplicity suggested by QCD. The method is based on a continuous dialog between experiment and theory. The paper follows the development of this research line, from its beginnings in the 1970's to the current state of the art, discussing how it produced both sound interpretations of the most relevant experimental facts and intriguing perspectives for new physics signals in the TeV energy domain.
    International Journal of Modern Physics A 01/2012; 20(17). · 1.09 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The theory of strong interactions, quantum chromodynamics (QCD), is quite successful in predicting and describing many features of multiparticle production processes at high energies. In this paper, the general perturbative QCD approach to these processes (primarily e+e--annihilation) is briefly formulated, and associated problems are discussed. It is shown that analytical calculations at the parton level using a low-momentum cutoff are surprisingly adequate in describing experimental data on the final hadronic state in multiparticle production processes at high energies --- even though the perturbative expansion parameter is not very small. More importantly, the perturbative QCD not only describes existing data but also predicts many qualitatively new and intriguing phenomena.
    Physics-Uspekhi 05/2002; 45(5):507. · 1.89 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We study the moments of multiplicty distribution and its relation to the Lee-Yang zeros of the generating function in electron-positron and hadron-hadron high energy collision. Our work shows that GMD moments can reproduce the oscillatory behaviour as shown in the experimental data and predicted by quantum chromodynamics at preasymptotic energy, while it can also be used to distinguish electron-positron (e+e-) multiplicity data from hadron-hadron (pp and ) multiplicity. Furthermore, there seems to be a link between the development of shoulder structure in the multiplicity distribution and the development of ear structure in the Lee-Yang zeros. We predict that these structures is going to be very obvious at 14 TeV. We argue that the development of these structures indicates an ongoing transition from quark-dominated soft scattering events to gluon-dominated semihard scattering events.
    International Journal of Modern Physics A 01/2012; 24(18n19). · 1.09 Impact Factor

Full-text (3 Sources)

Download
35 Downloads
Available from
May 20, 2014