Predictions forsNN=5.02TeV Pb + Pb collisions from a multiphase transport model

Abstract

We present predictions from the string melting version of a multiphase transport model on various observables in Pb+Pb collisions at √ s NN = 5.02 TeV. We use the same version of the model as an earlier study that reasonably reproduced dN/dy, p T spectra and elliptic flow of charged pions and kaons at low-p T for central and semicentral heavy ion collisions at 200 GeV and 2.76 TeV. While we compare with the already-available centrality dependence data on charged particle dN/dη at mid-pseudorapidity in Pb+Pb collisions at 5.02 TeV, we make predictions on identified particle dN/dy, p T spectra, azimuthal anisotropies v n (n = 2,3,4), and factorization ratios r n (η a ,η b )(n = 2,3) for longitudinal correlations.

Nuclear cluster structure effect on elliptic and triangular flows in heavy-ion collisions

“…AMPT has been extensively applied to simulate heavy-ion collisions in a wide colliding energy range from the SPS to the LHC, which contains the initial conditions from the HIJING model [46,47], partonic interactions modelled by a parton cascade model (ZPC) [48], hadronization in a simple quark coalescence model, and hadronic rescattering simulated by a relativistic transport (ART) model [49]. AMPT is successful to describe physics in relativistic heavy-ion collision for the RHIC [45] and the LHC energies [50], including pion-pair correlations [51], di-hadron azimuthal correlations [52] as well as collective flow etc [53,54].…”

Ω and ϕ in Au + Au collisions at and 11.5 GeV from a multiphase transport model

“…Recently, a systematic study of predictions for √ s NN =5.02 TeV Pb+Pb collisions is updated by the same authors with new tuned parameters [35]. Here we tune the parameters in the model to study the dynamics of Ω and φ production in Au+Au collisions at √ s NN = 200 and 11.5 GeV.…”

“…In particular, we apply a small parton cascade cross section of 1.5 mb in comparison with the parameter sets of 3 mb as discussed in Ref. [35]. According to the Eq.…”

Baryon spectra and antiparticle-to-particle ratios from the improved AMPT model

“…In this new AMPT model, we use the Lund string fragmentation parameters a = 0.55 for Au+Au collisions at 200 GeV and a = 0.2 for Pb+Pb collisions at 2.76 TeV respectively, and b = 0.15 GeV −2 for both collisions. The relative production of strange to nonstrange quarks from Lund string fragmentation is still kept 0.4 and the strong coupling constant is set to α s = 0.33 as in earlier studies [2,3], while the parton cross section is set to 1.5 mb instead of 3 mb in those earlier studies. Figure 2 shows the results for Pb+Pb collisions at 2.76 TeV.…”

“…With a new set of key parameters, the string melting AMPT model was improved to reasonably reproduce the dN/dy yields, p T spectra and elliptic flows of pions and kaons at low p T in heavy ion collisions at √ s NN = 200 GeV and 2.76 TeV [2]. It has also been used to predict the identified particles dN/dy, p T spectra, azimuthal anisotropies and longitudinal correlations in the Pb+Pb collisions at √ s NN = 5.02 TeV [3]. However, it still has some deficiencies on baryon descriptions.…”