Measurement of higher-order flow harmonics in sqrt(s_NN)=2.76 TeV Pb+Pb collisions with the ATLAS detector at the LHC

Not scheduled
Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 7
Poster Global and collective dynamics


Soumya Mohapatra (Department of Physics-State University of New York (SUNY))


Collective harmonic flow and jet-medium interactions are two phenomena under intense study in ultra-relativistic heavy ion collisions at RHIC and the LHC. One outstanding question is how to disentangle these two contributions for various single and multiple particle observables. Both higher-order harmonic flow ($v_1$, $v_2$, $v_3$, ...) and jet-medium interactions, for example, have been argued to be responsible for several novel structures observed in two-particle $\Delta\eta$ and $\Delta\phi$ correlations. In this poster, we present ATLAS measurement of two particle correlation in a broad momentum and centrality range. We carry out a Fourier analysis of the correlation function and extract the individual flow harmonics. We compare the first six terms($v_1$-$v_6$) with those measured independently from an event plane method. We discuss the impact of these results for disentangling harmonic flow and jet-medium effect, and for understanding the nature of transition from the flow-dominated low $p_T$ region to the jet-dominated high $p_T$ region.

Primary author

Soumya Mohapatra (Department of Physics-State University of New York (SUNY))

Presentation materials