Quark Coalescence and Elliptic Flow of Charm Hadrons

Elliptic flow of charm hadrons is investigated based on the quark coalescence model. Due to the large difference between the charm quark and light quark masses, hadrons containing both light and charm quarks show a qualitatively different $v_2(p_\perp)$ than hadrons containing only light quarks. Simple relations are proposed to infer quark $v_2$ from those of hadrons. The effects of the finite momentum spread of hadron wavefunctions are also studied, and are small for charm hadrons.