Measurements of two-particle correlations in e+e- collisions at 91-209 GeV with ALEPH archived data

Measurements of two-particle angular correlations of charged particles

emitted in hadronic $Z$ decays and high energy e+e- annihilations are presented. The archived e⁺e^-

annihilation data at a center-of-mass energy of 91-209 GeV were collected with the

ALEPH detector at LEP between 1992 and 2000. The correlation functions are

measured over a broad range of pseudorapidity and full azimuth as a function of

charged particle multiplicity. At 91 GeV, no significant long-range correlation is

observed in either the lab coordinate analysis or the thrust coordinate

analysis, where the latter is sensitive to a medium expanding transverse to the

color string between the outgoing q\bar{q} pair from Z boson decays. The

associated yield distributions in both analyses are in better agreement with

the prediction from the PYTHIA v6.1 event generator than from HERWIG v7.1.5.

They provide new insights to showering and hadronization modeling.

Preliminary results with e+e- data in LEP2 will also be presented.

These results serve as an important reference to the observed long-range correlation

in proton-proton, proton-nucleus, and nucleus-nucleus collisions.