Elliptic flow of $η$ and $π^{0}$ Mesons in Heavy-Ion Collisions at 2 AGeV

Details Elliptic flow of $η$ and $π^{0}$ Mesons in Heavy-Ion Collisions at 2 AGeV Elliptic flow of $η$ and $π^{0}$ Mesons in Heavy-Ion Collisions at 2 AGeV

1999-10-05

arxiv.org/abs/nucl-ex/9910002v1

Czech.J.Phys. 50S4 (2000) 139-166

Physics

Nuclear Physics

Nuclear Experiment

34 pages, presented at V TAPS workshop, Rez, September 4-8. 1999

Scientific paper

Azimuthal distributions of $\eta$ and $\pi^{0}$ mesons emitted at midrapidity in collisions of 1.9 AGeV $^{58}$Ni+$^{58}$Ni and 2 AGeV $^{40}$Ca+$^{nat}$Ca are studied as a function of the number of projectile-like spectator nucleons. The observed anisotropy corresponds to a negative elliptic flow signal for $\eta$ mesons, indicating a preferred emission perpendicular to the reaction plane. In contrast, only small azimuthal anisotropies are observed for $\pi^{0}$ mesons. This may indicate that $\eta$ mesons freeze out earlier from the fire ball than pions.

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