Two-particle angular correlations are measured in high-multiplicity proton-proton collisions at = 13 TeV by the ALICE Collaboration. The yields of particle pairs at short-(eta similar to 0) and long-range (1.6 < || < 1.8) in pseudorapidity are extracted on the near-side ( 0). They are reported as a function of transverse momentum (p(T)) in the range 1 < p(T)< 4 GeV/c. Furthermore, the event-scale dependence is studied for the first time by requiring the presence of high-p(T) leading particles or jets for varying p(T) 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-p(T) 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 p(T) dependency, while overestimating the event-scale dependency.
Long- and short-range correlations and their event-scale dependence in high-multiplicity pp collisions at √s = 13 TeV
D. ColellaMembro del Collaboration Group
;D. Di BariMembro del Collaboration Group
;M. Mazzilli;A. PalascianoMembro del Collaboration Group
;G. VolpeMembro del Collaboration Group
;
2021-01-01
Abstract
Two-particle angular correlations are measured in high-multiplicity proton-proton collisions at = 13 TeV by the ALICE Collaboration. The yields of particle pairs at short-(eta similar to 0) and long-range (1.6 < || < 1.8) in pseudorapidity are extracted on the near-side ( 0). They are reported as a function of transverse momentum (p(T)) in the range 1 < p(T)< 4 GeV/c. Furthermore, the event-scale dependence is studied for the first time by requiring the presence of high-p(T) leading particles or jets for varying p(T) 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-p(T) 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 p(T) dependency, while overestimating the event-scale dependency.File | Dimensione | Formato | |
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