Reexamination for the calculation of elliptic flow and other fourier harmonics

Details Reexamination for the calculation of elliptic flow and other fourier harmonics Reexamination for the calculation of elliptic flow and other fourier harmonics

2008-04-23

arxiv.org/abs/0804.3655v3

Physics

Nuclear Physics

Nuclear Theory

4 pages,1 figures

Scientific paper

We have argued that the azimuthal symmetry and asymmetry components in fourier expansion of particle momentum azimuthal distribution, $v_n$ (n=0, 1, 2, ...), should be calculated as an average of $cos(n\phi)$ first over particles in an event and then over events (event-wise average) rather than "an average over all particles in all events" (particle-wise average). In case of large centrality (multiplicity) bin the particle-wise average is not accurate because the influence (fluctuation) of particle multiplicity was not taken into account.

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