First analysis of anisotropic flow with Lee-Yang zeroes

We report on the first analysis of directed and elliptic flow with the new method of Lee--Yang zeroes. Experimental data are presented for Ru+Ru reactions at 1.69 AGeV measured with the FOPI detector at SIS/GSI. The results obtained with several methods, based on the event-plane reconstruction, on Lee--Yang zeroes, and on multi-particle cumulants (up to 5th order) applied for the first time at SIS energies, are compared. They show conclusive evidence that azimuthal correlations between nucleons and composite particles at this energy are largely dominated by anisotropic flow.

Note:

5 pages, 3 figures, submitted to Phys. Rev. C Rapid Com

25.75.Ld
25.70.-z
scattering: heavy ion
ruthenium
collective phenomena
particle flow
elliptic flow
transverse momentum dependence
functional analysis
cumulant expansion

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