Theoretical physics / Elméleti fizika

Kőfaragó Mónika (University of Utrecht, CERN ALICE): Modification of the near-side jet peak at $\sqrt{s_{\rm{NN}}}=2.76$ TeV Pb--Pb collisions measured by the ALICE detector

Europe/Budapest
Tanacsterem

Tanacsterem

Description
Two-particle angular correlation measurements are sensitive probes of the interactions of the medium formed in heavy-ion collisions and the particles propagating through it. Such measurements are done by determining the distribution of the pseudorapidity ($\Delta\eta$) and azimuthal angle ($\Delta\varphi$) difference of all particle pairs as a function of centrality and $p_{\rm{T}}$. The contribution of jets and mini-jets appears as a peak around ($\Delta\varphi, \Delta\eta) = (0,0)$ and the modification of the shape of this peak in Pb--Pb collisions can give insight on the interaction of propagating particles with the medium. The observed jet peak becomes significantly broader in the $\Delta\eta$ direction towards central collisions at low $p_{\rm{T}}$. To characterize this broadening, the peak is fitted with a Generalized Gaussian function and the width of the peak is compared to results from pp collisions and to different Monte Carlo generators to study whether the interplay of jets and collective flow can result in the observed behavior.
Slides