Elliptic flow of η and π Mesons in Heavy-Ion Collisions at 2 AGeV
نویسنده
چکیده
Azimuthal distributions of η and π mesons emitted at midrapidity in collisions of 1.9 AGeV Ni+Ni and 2 AGeV Ca+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 η mesons, indicating a preferred emission perpendicular to the reaction plane. In contrast, only small azimuthal anisotropies are observed for π 0 mesons. This may indicate that η mesons freeze out earlier from the fire ball than pions.
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