Long-range near-side correlation in $e^+e^-$ Collisions at 183-209 GeV with ALEPH Archived Data
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866911987005390848 |
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| author | Chen, Yu-Chen Chen, Yi Badea, Anthony Baty, Austin Innocenti, Gian Michele Maggi, Marcello McGinn, Christopher Peters, Michael Sheng, Tzu-An Thaler, Jesse Lee, Yen-Jie |
| author_facet | Chen, Yu-Chen Chen, Yi Badea, Anthony Baty, Austin Innocenti, Gian Michele Maggi, Marcello McGinn, Christopher Peters, Michael Sheng, Tzu-An Thaler, Jesse Lee, Yen-Jie |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2312_05084 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Long-range near-side correlation in $e^+e^-$ Collisions at 183-209 GeV with ALEPH Archived Data Chen, Yu-Chen Chen, Yi Badea, Anthony Baty, Austin Innocenti, Gian Michele Maggi, Marcello McGinn, Christopher Peters, Michael Sheng, Tzu-An Thaler, Jesse Lee, Yen-Jie High Energy Physics - Experiment Nuclear Experiment 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. |
| title | Long-range near-side correlation in $e^+e^-$ Collisions at 183-209 GeV with ALEPH Archived Data |
| topic | High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2312.05084 |