Naslov
Long- and short-range correlations and their event-scale dependence in high-multiplicity pp collisions at √s=13 TeV

Autori
Acharya, S. ; ... ; Antičić, Tome ; Erhardt, Filip ; Gotovac, Sven ; Jerčić, Marko ; Karatović, David ; Lončar, Petra ; Mudnić, Eugen ; Planinić, Mirko ; Poljak, Nikola ; Vicković, Linda ; ... ; Zurlo, N.

Kolaboracija
ALICE Collaboration

Izvornik
The Journal of high energy physics (1126-6708) 2021 (2021), 5; 290, 28

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
heavy ion experiments ; correlation: short-range ; correlation: long-range ; multiplicity: high ; pp: scattering ; particle: yield ; angular correlation: two-particle ; CERN LHC Collt ; ransverse momentum ; leading particle ; collective ; rapidity ; PYTHIA ; ALICE ; experimental results ; 13000 GeV-cms/nucleon

Sažetak
Two-particle angular correlations are measured in high-multiplicity proton-proton collisions at s√ = 13 TeV by the ALICE Collaboration. The yields of particle pairs at short-(∆η ∼ 0) and long-range (1.6 < |∆η| < 1.8) in pseudorapidity are extracted on the near-side (∆φ ∼ 0). They are reported as a function of transverse momentum (pT) in the range 1 < pT < 4 GeV/c. Furthermore, the event-scale dependence is studied for the first time by requiring the presence of high-pT leading particles or jets for varying pT thresholds. The results demonstrate that the long- range “ridge” yield, possibly related to the collective behavior of the system, is present in events with high-pT processes as well. The magnitudes of the short- and long-range yields are found to grow with the event scale. The results are compared to EPOS LHC and PYTHIA 8 calculations, with and without string-shoving interactions. It is found that while both models describe the qualitative trends in the data, calculations from EPOS LHC show a better quantitative agreement for the pT dependency, while overestimating the event-scale dependency.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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