Physics Letters B (Sep 2024)

Long-range near-side correlation in e+e− collisions at 183-209 GeV with ALEPH archived data

  • Yu-Chen Chen,
  • Yi Chen,
  • Anthony Badea,
  • Austin Baty,
  • Gian Michele Innocenti,
  • Marcello Maggi,
  • Christopher McGinn,
  • Michael Peters,
  • Tzu-An Sheng,
  • Jesse Thaler,
  • Yen-Jie Lee

Journal volume & issue
Vol. 856
p. 138957

Abstract

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The first measurement of two-particle angular correlations for charged particles with LEP-II data is presented. The study is performed using archived hadronic e+e− data collected by ALEPH at center-of-mass energies up to 209 GeV, above the W+W− production threshold, which provide access to unprecedented charged-particle multiplicities and more complex color-string configurations if compared to previous measurements at LEP-I energies. An intriguing long-range near-side excess is observed in the correlation function measured with respect to the thrust axis in the highest multiplicity interval (Ntrk≥50). Such a structure is not predicted by the Monte-Carlo simulation. The harmonic anisotropy coefficients vn, which result from the Fourier expansion of the two-particle correlation functions, were also measured for the first time in e+e− data, and compared to pythia 6 predictions and to the results obtained in proton-proton collisions. The results presented in the Letter provide novel experimental constraints on the formation of collective phenomena in point-like e+e− collisions.