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Azimuthal anisotropy of charged jet production in √sNN=2.76 TeV Pb–Pb collisions
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Azimuthal anisotropy of charged jet production in √sNN=2.76 TeV Pb–Pb collisions

J. Adam, D. Adamová, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.753, 頁碼.511-525
02/2016
DOI: https://doi.org/10.1016/j.physletb.2015.12.047

摘要

Nuclear and High Energy Physics
We present measurements of the azimuthal dependence of charged jet production in central and semi-central s <sub>NN</sub> =2.76 TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified as v <sub>2</sub> <sup>ch jet</sup> . Jet finding is performed employing the anti-k <sub>T</sub> algorithm with a resolution parameter R=0.2 using charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the jet spectra for different event plane orientations independently. Significant non-zero v <sub>2</sub> <sup>ch jet</sup> is observed in semi-central collisions (30–50% centrality) for 20<p <sub>T</sub> <sup>ch jet</sup> <90 GeV/c. The azimuthal dependence of the charged jet production is similar to the dependence observed for jets comprising both charged and neutral fragments, and compatible with measurements of the v <sub>2</sub> of single charged particles at high p <sub>T</sub> . Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions.

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