Abstract
These proceedings discuss the sensitivity of the nuclear modification factor RAA of fully reconstructed jets to cold nuclear matter effects. To test the parton energy loss interpretation of the observed RAA of ∼0.3, obtained from reconstructed jets in Pb–Pb collisions at = 2.76 TeV, we measured the inclusive jet production in minimum bias p–Pb collisions at = 5.02 TeV for resolution parameters R=0.2 and 0.4. The reconstructed jets incorporate the neutral and charged energy component and cover a momentum range = 20-90 GeV. The comparison of the jet yield to PYTHIA simulations shows no significant depletion in the measured jet cross section attributed to cold nuclear matter effects present in p–Pb collisions.
Highlights
The depletion of the reconstructed jet yield in heavy-ion collisions, quantified by RAA and RCP, was demonstrated by several measurements at the LHC
These proceedings discuss the sensitivity of the nuclear modification factor RAA of fully reconstructed jets to cold nuclear matter effects
Cold nuclear matter effects incorporate several mechanisms by which the jet cross section in a nucleus-nucleus collision can be modified with respect to a pp reference, aside from energy loss due to a deconfined phase of the collision
Summary
The depletion of the reconstructed jet yield in heavy-ion collisions, quantified by RAA and RCP, was demonstrated by several measurements at the LHC. Cold nuclear matter effects have been suggested to possibly contribute to the measured suppression of jets in heavy-ion collisions. Cold nuclear matter effects incorporate several mechanisms by which the jet cross section in a nucleus-nucleus collision can be modified with respect to a pp reference, aside from energy loss due to a deconfined phase of the collision [6] One of these mechanisms is that by taking pp collisions as a reference one does not preclude the fact that measurements in heavy-ion collisions may already deviate from the former due to a modified parton distribution function (PDF) of a nucleon as part of a nucleus with respect to a free proton [7]. Of primary importance for the present analysis is its inner tracking system (ITS) and the time projection chamber (TPC) for charged track reconstruction, as well as the electromagnetic calorimeter (EMCal) for determining the neutral energy component of reconstructed jets
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