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.

10 pages, 11 figures

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• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
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Cited by in corpus (11)

• Further developments of a multi-phase transport model for relativistic nuclear collisions
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• Characterizing nuclear modification effects in high-energy O-O collisions at energies available at the CERN Large Hadron Collider: A transport model perspective
• Disentangling the development of collective flow in high energy proton proton collisions with a multiphase transport model
• AMY Lorentz invariant parton cascade -- the thermal equilibrium case
• Nuclear cluster structure effect in ${}^{16}$O+${}^{16}$O collisions at the top RHIC energy
• Exploring light nuclei production at RHIC and LHC energies with A Multi-Phase Transport model and a coalescence afterburner
• Production of $X_{cs\bar{c}\bar{s}}$ in heavy ion collisions
• Studies of beauty hadron and non-prompt charm hadron production in pp collisions at $\sqrt{s}$=13 TeV within a transport model approach
• Understanding the medium-like effects in the jet-like yield in pp and p-Pb collisions using event generators
• Open charm production and ${\Lambda }_c^{+}/D^0$ ratio in pp and Au+Au collisions at the RHIC