Update of a Multi-Phase Transport Model with Modern Parton Distribution Functions and Nuclear Shadowing

Abstract

A multi-phase transport (AMPT) model has been successful in explaining a wide range of observables in relativistic heavy ion collisions. In this work, we implement a modern set of free proton parton distribution functions and an impact parameter-dependent nuclear shadowing in the AMPT model. After refitting the parameters of the two-component initial condition model to the experimental data on $pp$ and $p\bar{p}$ total and inelastic cross sections from $\sqrt{s}\sim$ 4 GeV to 13 TeV, we study particle productions in $pp$ and $AA$ collisions. We show that the updated AMPT model with string melting can reasonably describe the overall particle yields and transverse momentum spectra for both $pp$ and $AA$ collisions at RHIC and LHC energies after we introduce a nuclear scaling of the minijet transverse momentum cutoff for $AA$ collisions at LHC energies that is motivated by the color glass condensate. Since heavy flavor and high-$p_{\mathrm{T}}$ particles are produced by perturbative-QCD processes and thus directly depend on parton distribution functions of nuclei, the updated AMPT model is expected to provide a more reliable description of these observables.

arXiv comment10 pages, 11 figures

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• Improvement of heavy flavor productions in a multi-phase transport model updated with modern nPDFs
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• AMY Lorentz invariant parton cascade -- the thermal equilibrium case
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• Left-right splitting of elliptic flow due to directed flow in heavy ion collisions
• Open charm production and ${\Lambda }_c^{+}/D^0$ ratio in pp and Au+Au collisions at the RHIC
• Studies of beauty hadron and non-prompt charm hadron production in pp collisions at $\sqrt{s}$=13 TeV within a transport model approach
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