Open charm production and ${\Lambda }_c^{+}/D^0$ ratio in pp and Au+Au collisions at the RHIC

Abstract

We study open charm hadrons production in pp and Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$~GeV using an improved a multi-phase transport (AMPT) model. Specifically, we show the transverse-momentum spectra and nuclear modification factors $R_{\mathrm{AA}}$ of $D^0$ mesons and ${\Lambda }_c^{+}$ baryons, as well as the ${\Lambda }_c^{+}/D^0$ ratio in pp and Au+Au collisions. The results obtained from the AMPT model simulations are compared with the STAR experimental data and found to be consistent. We further investigate the ${\Lambda }_c^{+}/D^0$ ratio by evaluating contributions from coalescence, fragmentation, and the combined coalescence+fragmentation mechanisms, and we find that fragmentation alone underestimates the pronounced enhancement in Au+Au relative to pp at low and intermediate $p_{\mathrm{T}}$, whereas the coalescence+fragmentation mechanism reproduces the observed trend significantly better. These results indicate that coalescence plays a key role in charm baryon productions and helps constrain the relative importance of different hadronization mechanisms in the ultra-relativistic nuclear collisions.

9 pages, 5 figures

References in corpus (14)

• Heavy quarkonium: progress, puzzles, and opportunities
• ${\mathbf{D}}_{\mathbf{s}}$-Meson as Quantitative Probe of Diffusion and Hadronization in Nuclear Collisions
• Properties of the QCD Matter -- An Experimental Review of Selected Results from RHIC BES Program
• Further developments of a multi-phase transport model for relativistic nuclear collisions
• Centrality and transverse momentum dependence of $D^0$-meson production at mid-rapidity in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200\mathrm{GeV}$
• A Study of the Properties of the QCD Phase Diagram in High-Energy Nuclear Collisions
• Open charm tomography of cold nuclear matter
• Energy loss in a partonic transport model including bremsstrahlung processes
• Observation of $D_s^{\pm }/D^0$ enhancement in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 200 GeV
• Update of a Multi-Phase Transport Model with Modern Parton Distribution Functions and Nuclear Shadowing
• Prerequisites for heavy quark coalescence in heavy-ion collisions
• Nuclear cluster structure effect in ${}^{16}$O+${}^{16}$O collisions at the top RHIC energy
• Transport-model investigation of scaling of the number of constituent quarks and the hadronic-partonic transition in Au + Au collisions
• Physics of Collectivity and EOS from the RHIC Beam Energy Scan Program