| Article | |
| Report number | arXiv:2312.05084 ; MITHIG-MOD-23-001 |
| Title | Long-range near-side correlation in $e^+e^-$ Collisions at 183-209 GeV with ALEPH Archived Data |
| Author(s) | Chen, Yu-Chen (MIT) ; Chen, Yi (MIT) ; Badea, Anthony (Chicago U.) ; Baty, Austin (Chicago U.) ; Innocenti, Gian Michele (CERN) ; Maggi, Marcello (INFN, Bari) ; McGinn, Christopher (MIT) ; Peters, Michael (MIT) ; Sheng, Tzu-An (MIT) ; Thaler, Jesse (MIT) ; Lee, Yen-Jie (MIT) |
| Publication | 2024-08-12 |
| Imprint | 2023-12-08 |
| Number of pages | 6 |
| Note | Accepted by PLB |
| In: | Phys. Lett. B 856 (2024) 138957 |
| DOI | 10.1016/j.physletb.2024.138957 (publication) |
| Subject category | nucl-ex ; Nuclear Physics - Experiment ; hep-ex ; Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LEP ; ALEPH |
| Abstract | 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 $N_{\mathrm{trk}}\geq 50$. Such a structure is not predicted by the Monte-Carlo simulation. The harmonic anisotropy coefficients $v_n$, 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 PYTHIA6 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. |
| Copyright/License | Publication: (License: CC-BY-4.0), sponsored by SCOAP³ publication: © 2024 The Author(s). Published by Elsevier B.V. Funded by SCOAP³. preprint: (License: CC BY 4.0) |
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Record creato 2023-12-12, modificato l'ultima volta il 2025-06-11
