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

Adamová, D. and Aggarwal, M. M. and Rinella, A. G. and Agnello, M. and Agrawal, N. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Varga-Kőfaragó, Mónika and Lévai, Péter and Oláh, László and Pochybova, Sona (2015) Measurement of jet suppression in central Pb–Pb collisions at √sNN=2.76 TeV. PHYSICS LETTERS B, 746. ISSN 0370-2693

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Abstract

The transverse momentum (pT) spectrum and nuclear modification factor (RAA) of recon- structed jets in 0–10% and 10–30% central Pb–Pb collisions at √sNN = 2.76 TeV were mea- sured. Jets were reconstructed using the anti-kT jet algorithm with a resolution parameter of R = 0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Elec- tromagnetic Calorimeter (EMCal). The jet pT spectra are reported in the pseudorapidity in- terval of |ηjet| < 0.5 for 40 < pT, jet < 120 GeV/c in 0–10% and for 30 < pT, jet < 100 GeV/c in 10–30% collisions. Reconstructed jets were required to contain a leading charged parti- cle with pT > 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 RAA. The nuclear modification factor RAA was found to be 0.28 ± 0.04 in 0–10% and 0.35 ± 0.04 in 10–30% collisions, indepen- dent of pT, jet 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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