The nuclear modification factor $R_{ AA}$ of non-photonic electrons in ${ Au} + { Au}$ collisions at $\sqrt{ s_{ NN}^{ }} = 200$ GeV is studied by considering the decays of heavy-flavor hadrons produced in a quark coalescence model. Although an enhanced $\Lambda_c/D^0$ ratio is predicted by the coalescence model, it is peaked at small transverse momenta ($\sim 2$ GeV) due to the large difference between heavy and light quark masses. As a result, the enhanced $\Lambda_c/D^0$ ratio, which is expected to suppress the electron $R_{ AA}$ as the branching ratio of $\Lambda_c$ decay into electrons is smaller than that of $D^0$, does not lead to additional suppression of the electron $R_{ AA}$ at large transverse momenta ($\ge 5$ GeV), where the suppression is mainly due to heavy quark energy loss in produced quark-gluon plasma. Also, the enhanced $\Lambda_b/\bar{ B}^0$ ratio predicted by the coalescence model has even smaller effect on the non-photonic electron $R_{ AA}$ as bottom baryons and mesons have similar branching ratios for semi-leptonic decays into electrons.
Categories: nucl-th hep-ph