Measurement of non-photonic single electron v2 at STAR

Frank Laue

Collaboration: STAR

Abstract:

In heavy-ion collisions at RHIC, heavy quarks are believed to originate almost exclusively from hard partonic collisions at first impact and are considered excellent probes of the subsequently formed medium. D-meson $v_2$ in heavy ion collisions might grant access to c-quark $v_2$ and also strengthen the case for novel processes to accelerate equilibration in partonic matter. As direct D-meson $v_2$ measurements are not available, non-photonic single electron measurements at sufficiently high transverse momenta serve as a substitute. In the $p_T$ region $p_T$=2-5 GeV/c, the single electron spectrum is expected to be dominated by the decay of D-Mesons. Simulations have shown the single electron $v_2$ to be a good proxy for D-meson $v_2$. We will present single electron $v_2$ measurements from Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and discuss them in the context of quark coalescence and thermalization.

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