Abstract
Measurements of the suppression of high-pT particles and the away-side jets from heavy-ion collisions at RHIC have shown that medium-induced energy loss affects partons produced in the early stage of a heavy-ion collision. At LHC energies the initial production cross-section is much higher, which allows jets to be reconstructed with a wide kinematic range. Measuring fully reconstructed jets by taking advantage of the ALICE Electromagnetic Calorimeter allows for a more differential investigation of the parton energy loss. Parton energy loss will allow us to access key observables of the hot, dense matter created in heavy ion collisions. The data presented was collected during the 2.76 TeV Pb-Pb runs, as well as baseline measurements from the 2.76 TeV pp run. The procedures used to reconstruct jets and extract them from a fluctuating background will be discussed. The procedure for quantifying the background with a limited acceptance will also be discussed. These results are compared to pp measurements and simulations.
Highlights
One of the aims of studying heavy-ion collisions is to investigate how partons lose energy in the quark gluon plasma (QGP) that is formed in these collisions
HighpT particle measurements, a proxy for jets, as well as other jet measurements have shown that the jet spectrum in heavy-ion collisions does deviate from what would be expected if the heavy-ion collision could be treated as a superposition of independent pp collisions [2, 3, 4, 5, 6, 7, 8]
The spectra combined with the differential cross section measured in pp collisions allowed us to determine the nuclear modification factor
Summary
One of the aims of studying heavy-ion collisions is to investigate how partons lose energy in the quark gluon plasma (QGP) that is formed in these collisions. 3. pp In order to fully quantify the modification of the jet spectrum in heavy-ion collisions due to the presence of the hot and dense QGP medium, the differential cross-section of fully reconstructed jets in pp collisions at 2.76 TeV was measured. Pb-Pb One of the main experimental challenges in heavy-ion collisions is removing the contribution from the underlying event from the jet spectrum This is done by determining the average background energy density, ρch+em, by finding the median of pT,jet/Ajet, where Ajet is the area and pT,jet is the uncorrected momentum of the kT jets. In order to have a stable result it was necessary to bias the collection of measured jets by requiring that the jets have a track with pT> 5 GeV/c This reduces the contribution to the measured spectrum due to the combinatorial background.
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