Nuclear modification factor of non-photonic electrons in heavy-ion collisions and the heavy-flavor baryon-to-meson ratio

Abstract

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.

REVTeX, 5 pages, 3 figures, to be published in Phys. Rev. C

References in corpus (4)

• Scaling properties of azimuthal anisotropy in Au+Au and Cu+Cu collisions at sqrt(s_NN) = 200 GeV
• Collisional dissociation of heavy mesons in dense QCD matter
• Charm elliptic flow at RHIC
• Λ_{c} enhancement from strongly coupled quark-gluon plasma