engleski

Dielectron azimuthal anisotropy at mid-rapidity in Au + Au collisions at $\sqrt{; ; s_{; ; NN}; ; }; ; $ = 200 GeV

We report on the first measurement of the azimuthal anisotropy (v2) of dielectrons (e+e− pairs) at mid-rapidity from sNN‾‾‾‾√=200 GeV Au + Au collisions with the STAR detector at the Relativistic Heavy Ion Collider (RHIC), presented as a function of transverse momentum (pT) for different invariant-mass regions. In the mass region Mee<1.1 GeV/c2 the dielectron v2 measurements are found to be consistent with expectations from π0, η, ω, and ϕ decay contributions. In the mass region 1.1<Mee<2.9GeV/c2, the measured dielectron v2 is consistent, within experimental uncertainties, with that from the cc⎯⎯ contributions.

Dielectron; anisotropy; STAR

STAR Collaboration.