Azimuthal anisotropy of jet particles in p-Pb and Pb-Pb collisions at √ sNN = 5.02 TeV
ALICE collaboration. (2024). Azimuthal anisotropy of jet particles in p-Pb and Pb-Pb collisions at √ sNN = 5.02 TeV. Journal of High Energy Physics, 2024, Article 234. https://doi.org/10.1007/JHEP08(2024)234
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Journal of High Energy PhysicsAuthors
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2024Copyright
© The Authors. Article funded by SCOAP3
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.
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Springer NatureISSN Search the Publication Forum
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https://converis.jyu.fi/converis/portal/detail/Publication/242674501
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Research Council of FinlandFunding program(s)
Centre of Excellence, AoFAdditional information about funding
Academy of Finland (Center of Excellence in Quark Matter) (grant nos. 346327, 346328), Finland.License
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