Abstract
We report results from the ALICE collaboration on jet production and jet properties in pp and Pb-Pb collisions at the LHC. The charged particle jet production cross-section and measurements of jet fragmentation and jet shape in pp collisions at = 7 TeV are presented. The results are confronted with simulations from Monte Carlo event generators. Measurements of charged particle jets in Pb-Pb collisions at = 2.76 TeV with resolution parameter R = 0.2 and R = 0.3 show a strong momentum dependent suppression in central relative to peripheral collisions. The analysis of the semi-inclusive distribution of charged particle jets recoiling from a high-pT trigger hadron allows an unbiased measurement of the jet structure for larger cone radii. No significant redistribution of the energy flow inside the jet cone is observed. Di-hadron correlations allow to assess jet structure at very low particle momenta. For 2 < pT,trig < 3 GeV/c and 1 < PT,assoc < 2 GeV/c, a strongly asymmetric near-side correlation, broader in Δη than Δϕ, is observed.
Highlights
Jets are collimated sprays of particles associated with hard-scattered partons
We report results from the ALICE collaboration on jet production and jet properties in pp and Pb-Pb collisions at the LHC
Interactions with the medium result in collisional energy loss and give rise to additional induced radiation, which emitted at small angles inside the jet cone can lead to a broadening of the jet profile
Summary
Jets are collimated sprays of particles associated with hard-scattered partons. The study of jet production and fragmentation allows us to test our understanding of perturbative and nonperturbative aspects of QCD. The coupling between partons and medium at a scale of the order of the initial parton energy may be weak, governed by perturbative dynamics. Empirical observations suggest that the thermal scale is relevant for the parton energy loss [2]. It has been predicted, that the coupling of jet fragments to the longitudinally flowing medium [3] or to turbulent color fields [4] will lead to broadening that is larger in pseudorapidity η than azimuthal angle φ (excentric jets).
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