Seminar In Hadronic Physics

Flow measurements from ATLAS

J. Jia

Stony Brook University

In recent years, the measurement of harmonic flow coefficients v_n has provided important information on the hot and dense matter created in heavy ion collisions at RHIC and LHC. These coefficients are now understood to reflect the hydrodynamic response to the fluctuating collision geometry in the initial state. I will present recent ATLAS measurements of the differential distribution of average v_n, the event-by-event distribution of v_n and the angular correlations among the harmonic planes in Pb+Pb collisions at √s_NN=2.76 TeV. I will discuss the new insights provided by these measurements on the nature of geometry fluctuations and possible non-linear effects in the hydrodynamic response.