Measurements of Inclusive Jet Spectra in Pp and Central Pb-Pb Collisions at Snn=5.02tev

This article reports measurements of the pT-differential inclusive jet cross-section in pp collisions at √ s = 5.02 TeV and the pT-differential inclusive jet yield in Pb–Pb 0–10% central collisions at √ sNN = 5.02 TeV. Jets were reconstructed at mid-rapidity with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm. For pp collisions, we report jet crosssections for jet resolution parameters R = 0.1−0.6 over the range 20 < pT,jet < 140 GeV/c, as well as the jet cross-section ratios of different R, and comparisons to two next-to-leading-order (NLO)based theoretical predictions. For Pb–Pb collisions, we report the R = 0.2 and R = 0.4 jet spectra for 40 < pT,jet < 140 GeV/c and 60 < pT,jet < 140 GeV/c, respectively. The scaled ratio of jet yields observed in Pb–Pb to pp collisions, RAA, is constructed, and exhibits strong jet quenching and a clear pT-dependence for R = 0.2. No significant R-dependence of the jet RAA is observed within the uncertainties of the measurement. These results are compared to several theoretical predictions. ∗See Appendix A for the list of collaboration members ar X iv :1 90 9. 09 71 8v 1 [ nu cl -e x] 2 0 Se p 20 19 Measurements of jet spectra in pp and Pb–Pb collisions at √ sNN = 5.02 TeV ALICE Collaboration