Measurements of inclusive jet spectra in pp and central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

This article reports measurements of the $p_{\mathrm{T}}$-differential inclusive jet cross-section in pp collisions at $\sqrt{s}$ = 5.02 TeV and the $p_{\mathrm{T}}$-differential inclusive jet yield in Pb-Pb 0-10% central collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. Jets were reconstructed at mid-rapidity with the ALICE tracking detectors and electromagnetic calorimeter using the anti-$k_{\mathrm{T}}$ algorithm. For pp collisions, we report jet cross-sections for jet resolution parameters $R=0.1-0.6$ over the range $20<p_{\mathrm{T},\mathrm{jet}}<140$ 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 $40<p_{\mathrm{T},\mathrm{jet}}<140$ GeV/$c$ and $60<p_{\mathrm{T},\mathrm{jet}}<140$ GeV/$c$, respectively. The scaled ratio of jet yields observed in Pb-Pb to pp collisions, $R_{\mathrm{AA}}$, is constructed, and exhibits strong jet quenching and a clear $p_{\mathrm{T}}$-dependence for $R=0.2$. No significant $R$-dependence of the jet $R_{\mathrm{AA}}$ is observed within the uncertainties of the measurement. These results are compared to several theoretical predictions.

31 pages, 8 captioned figures, 6 tables, authors from page 26, published version, figures at http://alice-publications.web.cern.ch/node/5560

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