Azimuthal anisotropy of jet particles in p-Pb and Pb-Pb collisions at sNN = 5.02 TeV

Summary, in English

The azimuthal anisotropy of particles associated with jets (jet particles) at midrapidity is measured for the first time in p-Pb and Pb-Pb collisions at sNN = 5.02 TeV down to transverse momentum (pT) of 0.5 GeV/c and 2 GeV/c, respectively, with ALICE. The results obtained in p-Pb collisions are based on a novel three-particle correlation technique. The azimuthal anisotropy coefficient v2 in high-multiplicity p-Pb collisions is positive, with a significance reaching 6.8σ at low pT, and its magnitude is smaller than in semicentral Pb-Pb collisions. In contrast to the measurements in Pb-Pb collisions, the v2 coefficient is also found independent of pT within uncertainties. Comparisons with the inclusive charged-particle v2 and with AMPT calculations are discussed. The predictions suggest that parton interactions play an important role in generating a non-zero jet-particle v2 in p-Pb collisions, even though they overestimate the reported measurement. These observations shed new insights on the understanding of the origin of the collective behaviour of jet particles in small systems such as p-Pb collisions, and provide significant stringent new constraints to models. © The Author(s) 2024.

• Author: S. Acharya; S. Basu; P. Christiansen; O. Matonoha; A.F. Nassirpour; A. Ohlson; D. Silvermyr; J. Staa; O. Vazquez Rueda; V. Vislavicius; N. Zurlo
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration
• Publishing year: 2024
• Language: English
• Publication/Series: Journal of High Energy Physics
• Volume: 2024
• Issue: 8
• Links: http://dx.doi.org/10.1007/JHEP08(2024)234
• Document type: Journal article
• Publisher: Springer
• Topic: Subatomic Physics
• Keywords: Heavy Ion Experiments; Jets; Particle Correlations and Fluctuations
• Status: Published
• ISBN/ISSN/Other: ISSN: 1029-8479