Correlations and flavors in jets in ALICE

Abstract

We report on the measurement of hadron composition in charged jets in pp at √s = 7 TeV and show the first data on particle type dependent jet fragmentation at the LHC. Further, we present (˄ + ˄)/2K0s ratios measured in charged jets in Pb-Pb collisions at √sNN = 2.76 TeV and in p-Pb collisions at √sNN = 5.02 TeV. While the ratio of the inclusive pT spectra of ˄ and KSS exhibits centrality dependent enhancement both in the Pb-Pb and p-Pb system, the (˄ + ˄)/2K0s ratio measured in charged jets reveals that jet fragmentation does not contribute to the observed baryon anomaly.Finally, we discuss the measurement of semi-inclusive pT spectra of charged jets that recoil from a high-pT hadron trigger in Pb-Pb and pp collisions at √sNN = 2.76 TeV and √s= 7 TeV, respectively. The jet yield uncorrelated with the trigger hadron is removed at the event-ensemble level without introducing a bias on the jet population, which is therefore infrared and collinear safe. The recoil jet yield in central Pb-Pb is found to be suppressed w.r.t. that from pp PYTHIA reference. On the other hand, there is no sign of intra-jet broadening even for anti-kT jets with a resolution parameter as large as R = 0.5.