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Azimuthal anisotropy of jet particles in p-Pb and Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

ALICE Collaboration
Dec 2022
摘要
The azimuthal anisotropy of particles associated with jets (jet particles) atmidrapidity is measured for the first time in p-Pb and Pb-Pb collisions at$\sqrt{s_{\rm NN}}$ = 5.02 TeV down to transverse momentum ($p_{\rm T}$) of 0.5GeV/$c$ and 2 GeV/$c$, respectively, with ALICE. The second-order Fouriercoefficient of the jet-particle azimuthal distribution ($v_2$) inhigh-multiplicity p-Pb collisions is positive, with a significance reaching6.8$\sigma$ at low $p_{\rm T}$. Comparisons with the inclusive charged-particle$v_2$ and with AMPT calculations are discussed. The model describesqualitatively the main features of the jet-particle $v_2$ in high-multiplicityp-Pb collisions and indicates that the positive jet-particle $v_2$ is generatedby parton interactions.
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