A1 Journal article (refereed)
Emergence of Long-Range Angular Correlations in Low-Multiplicity Proton-Proton Collisions (2024)

ALICE collaboration. (2024). Emergence of Long-Range Angular Correlations in Low-Multiplicity Proton-Proton Collisions. Physical Review Letters, 132(17), Article 172302. https://doi.org/10.1103/PhysRevLett.132.172302

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Publication details

All authors or editors: ALICE collaboration

Journal or series: Physical Review Letters

ISSN: 0031-9007

eISSN: 1079-7114

Publication year: 2024

Publication date: 26/04/2024

Volume: 132

Issue number: 17

Article number: 172302

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevLett.132.172302

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/95330

Web address of parallel published publication (pre-print):  https://doi.org/10.48550/arXiv.2311.14357

Abstract

This Letter presents the measurement of near-side associated per-trigger yields, denoted ridge yields, from the analysis of angular correlations of charged hadrons in proton-proton collisions at √s= 13 TeV. Long-range ridge yields are extracted for pairs of charged particles with a pseudorapidity difference of 1.4<|Δη|<1.8 and a transverse momentum of 1<2 GeV/c, as a function of the charged-particle multiplicity measured at midrapidity. This study extends the measurements of the ridge yield to the low multiplicity region, where in hadronic collisions it is typically conjectured that a strongly-interacting medium is unlikely to be formed. The precision of the new results allows for the first direct quantitative comparison with the results obtained in e+e− collisions at √s= 91 GeV, where initial-state effects such as pre-equilibrium dynamics and collision geometry are not expected to play a role. In the multiplicity range where the e+e− results have good precision, the measured ridge yields in pp collisions are substantially larger than the limits set in e+e− annihilations. Consequently, the findings presented in this Letter suggest that the processes involved in e+e− annihilations do not contribute significantly to the emergence of long-range correlations in pp collisions.

Keywords: particle physics; nuclear physics; quark-gluon plasma

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Ministry reporting: Yes

Reporting Year: 2024

Preliminary JUFO rating: 3