Abstract
Two-particle angular correlations provide a powerful tool to study jets and their modification in ultra-relativistic heavy-ion collisions. The study of the particle species dependence of correlation structures as a function of transverse momentum provides additional information on particle production mechanisms. In this contribution we present studies of a near-side jet-like correlation peak in h-h correlations in Pb-Pb collisions at = 2.76 TeV. We observe significant broadening of the jet-like peak that increases with decreasing ptrigT and passocT and with increasing centrality and additional broadening of the jet-like peak in Δη with respect to broadening in Δϕ in most central collisions.The prospects of expanding these studies to include strange particles (Λ, and K0S) is explored.
Highlights
IntroductionIn Pb–Pb collisions at LHC the jet shapes and fragmentation functions show modifications at low pT (large jet cone radii) in comparison to pp collisions but the high pT core is unchanged [1]
In Pb–Pb collisions at LHC the jet shapes and fragmentation functions show modifications at low pT in comparison to pp collisions but the high pT core is unchanged [1]. It was predicted for heavy-ion collisions that the jet shape can be deformed by a longitudinally flowing medium [2] and we might observe jets with asymmetrical cones in central heavyion collisions
Full jet reconstruction in central heavy-ion collisions is restricted to the jet high pT core due to fluctuations in the bulk
Summary
In Pb–Pb collisions at LHC the jet shapes and fragmentation functions show modifications at low pT (large jet cone radii) in comparison to pp collisions but the high pT core is unchanged [1]. It was predicted for heavy-ion collisions that the jet shape can be deformed by a longitudinally flowing medium [2] and we might observe jets with asymmetrical cones in central heavyion collisions. Baryon production in gluon jets is enhanced with respect to quark jets. Studying K0S-h and Λ-h (Λ-h), denoted V0−h (i.e. V0−hadron), correlations could provide samples enhanced in gluon or quark jets. An advantage of V0−h correlations is that it is possible to get a clean sample even at high pT (∼20 GeV/c) via reconstruction of the daughter tracks (K0S → π+π−, Λ → pπ− and Λ → pπ+)
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