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Measurement of jet suppression in central Pb–Pb collisions at √sNN=2.76 TeV
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Measurement of jet suppression in central Pb–Pb collisions at √sNN=2.76 TeV

J. Adam, D. Adamová, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, I. Ahmed, S.U. Ahn, I. Aimo, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.746, 頁碼.1-14
06/2015
DOI: https://doi.org/10.1016/j.physletb.2015.04.039

摘要

Nuclear and High Energy Physics
The transverse momentum (p <sub>T</sub> ) spectrum and nuclear modification factor (R <sub>AA</sub> ) of reconstructed jets in 0–10% and 10–30% central Pb–Pb collisions at s <sub>NN</sub> =2.76 TeV were measured. Jets were reconstructed using the anti-k <sub>T</sub> jet algorithm with a resolution parameter of R=0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal). The jet p <sub>T</sub> spectra are reported in the pseudorapidity interval of |η <sub>jet</sub> |<0.5 for 40<p <sub>T,jet</sub> <120 GeV/c in 0–10% and for 30<p <sub>T,jet</sub> <100 GeV/c in 10–30% collisions. Reconstructed jets were required to contain a leading charged particle with p <sub>T</sub> >5 GeV/c to suppress jets constructed from the combinatorial background in Pb–Pb collisions. The leading charged particle requirement applied to jet spectra both in pp and Pb–Pb collisions had a negligible effect on the R <sub>AA</sub> . The nuclear modification factor R <sub>AA</sub> was found to be 0.28±0.04 in 0–10% and 0.35±0.04 in 10–30% collisions, independent of p <sub>T,jet</sub> within the uncertainties of the measurement. The observed suppression is in fair agreement with expectations from two model calculations with different approaches to jet quenching.

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