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The measurement of two-particle angular correlations is a powerful tool tostudy jet quenching in a $p_{\mathrm{T}}$ region inaccessible by direct jetidentification. In these measurements pseudorapidity ($\Delta\eta$) andazimuthal ($\Delta\varphi$) differences are used to extract the shape of thenear-side peak formed by particles associated to a higher $p_{\mathrm{T}}$trigger particle ($1 < p_{\mathrm{T, trig}} <$ 8 GeV/c). A combined fit of thenear-side peak and long-range correlations is applied to the data allowing theextraction of the centrality evolution of the peak shape in Pb-Pb collisions at$\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV. A significant broadening of the peak inthe $\Delta\eta$ direction at low $p_{\mathrm{T}}$ is found from peripheral tocentral collisions, which vanishes above 4 GeV/c, while in the $\Delta\varphi$direction the peak is almost independent of centrality. For the 10% mostcentral collisions and $1 < p_{\mathrm{T, assoc}} <$ 2 GeV/c, $1 <p_{\mathrm{T, trig}} <$ 3 GeV/c a novel feature is observed: a depletiondevelops around the centre of the peak. The results are compared to ppcollisions at the same centre of mass energy and to AMPT model simulations. Thecomparison to the investigated models suggests that the broadening and thedevelopment of the depletion is connected to the strength of radial andlongitudinal flow.

Anomalous evolution of the near-side jet peak shape in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV