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

Phys.Rev.Lett. 123 (2019) 212002, 2019.

Abstract (data abstract)
Measurements of two-particle angular correlations of charged particles emitted in hadronic Z decays are presented. The archived eþe− annihilation data at a center-of-mass energy of 91 GeV were collected with the ALEPH detector at LEP between 1992 and 1995. The correlation functions are measured over a broad range of pseudorapidity and full azimuth as a function of charged particle multiplicity. 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 qq ̄ 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. These results serve as an important reference to the observed long-range correlation in proton-proton, proton-nucleus, and nucleus-nucleus collisions.

  • Figure 2 Lab

    Data from the plot labeled Lab coordinates in Figure 2.

    10.17182/hepdata.99975.v1/t1

    Correlated yield obtained from the ZYAM procedure as a function of |Deltaphi| averaged over 1.6 < |Deltaeta| < 3.2 in...

  • Figure 2 Thrust

    Data from the plot labeled Thrust coordinates in Figure 2.

    10.17182/hepdata.99975.v1/t2

    Correlated yield obtained from the ZYAM procedure as a function of $|\Delta\phi |$ averaged over $1.6 < |\Delta\eta| < 3.2$...

  • Figure 3 Lab

    Data from the plot in Figure 3.

    10.17182/hepdata.99975.v1/t3

    Confidence limits on associated yield with lab coordinates as a function of avg N_trk^corr. NOTE in the PRL paper figure...

  • Figure 3 Thrust

    Data from the plot in Figure 3.

    10.17182/hepdata.99975.v1/t4

    Confidence limits on associated yield with thrust coordinates as a function of avg N_trk^corr.

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