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.
Highlights
Related content- Jet production in pp, p--Pb and Pb--Pb collisions measured by ALICE Rosi Reed and ALICE Collaboration
A jet is a collimated spray of particles that is produced in the process of parton showering, when a highly virtual parton fragments
Since it is ambiguous to associate final state hadrons with initial partons, the assignment of hadrons to jets is based on the decision of a reconstruction algorithm
Summary
- Jet production in pp, p--Pb and Pb--Pb collisions measured by ALICE Rosi Reed and ALICE Collaboration. - Charged-particle multiplicity and transverse energy in Pb–Pb collisions at \mathbf {{\sqrt{s_{\mathbf NN}}}}\mathbf {=2.76} TeV with ALICE Constantin Loizides and the ALICE collaboration
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