Jet shapes in pp and Pb-Pb collisions at ALICE

Understand

The aim of this work is to explore possible medium modifications to the substructure of inclusive charged jets in Pb-Pb relative to proton-proton collisions by measuring a set of jet shapes.

• The set of shapes includes the radial moment, $g$, and the momentum dispersion $p_{\mathrm{T}}$D.
• They provide complementary information on the fragmentation and can help to discriminate between two different scenarios: intra-jet broadening or collimation as a result of jet quenching.
• \noindent The shapes are measured in Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with a constituent cutoff of 0.15 GeV/c and jet resolution $R=$ 0.2.