# Measurement of jet suppression in central Pb-Pb collisions at root s(NN)=2.76 TeV

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## Abstract

The transverse momentum(p(T)) spectrum and nuclear modification factor (R-AA) of reconstructed jets in 0-10% and 10-30% central Pb-Pb collisions at root s(NN) = 2.76 TeV were measured. Jets were reconstructed using the anti-k(T) 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(T) spectra are reported in the pseudorapidity interval of \eta(jet)\ &lt; 0.5 for 40 &lt; p(T), jet &lt; 120 GeV/c in 0-10% and for 30 &lt; p(T), jet &lt; 100 GeV/c in 10-30% collisions. Reconstructed jets were required to contain a leading charged particle with p(T) &gt; 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-AA. The nuclear modification factor R-AA was found to be 0.28 +/- 0.04 in 0-10% and 0.35 +/- 0.04 in 10-30% collisions, independent of p(T), 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.

Item Type: Article transverse-momentum dependence; charged-particle production; induced gluon radiation; lead-lead collisions; pp collisions; atlas detector; collaboration; perspective; plasma; matter NATURAL SCIENCES > Physics Division of Experimental Physics Tome Antičić 13 Apr 2016 11:47 01 Feb 2017 12:15 http://fulir.irb.hr/id/eprint/2716 10.1016/j.physletb.2015.04.039