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Manuscript Title: PACIAE 2.0: An updated parton and hadron cascade model (program) for the relativistic nuclear collisions
Authors: Ben-Hao Sa, Dai-Mei Zhou, Yu-Liang Yan, Xiao-Mei Li, Sheng-Qin Feng, Bao-Guo Dong, Xu Cai
Program title: PACIAE version 2.0
Catalogue identifier: AEKI_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 183(2012)333
Programming language: FORTRAN 77.
Computer: DELL Studio XPS and others with a FORTRAN 77 or GFORTRAN compiler.
Operating system: Unix/Linux.
RAM: 1G words
Word size: 64 bits
Keywords: Relativistic nuclear collision, Transport (cascade) model, Hadron, parton, Parton rescattering, Hadronization, Hadron rescattering.
PACS: 25.75.Dw, 24.10.Lx.
Classification: 11.2.

Nature of problem:
The Monte Carlo simulation of hadron transport (cascade) model is successful in studying the observables at final state in the relativistic nuclear collisions. However the high pT suppression, the jet quenching (energy loss), and the eccentricity scaling of v2 etc., observed in high energy nuclear collisions, indicates the important effect of the initial partonic state on the final hadronic state. Therefore better parton and hadron transport (cascade) models for the relativistic nuclear collisions are highly required.

Solution method:
The parton and hadron cascade model PACIAE is originally based on the JETSET 7.4 and PYTHIA 5.7. The PYTHIA model has been updated to PYTHIA 6.4 with the additions of new physics, the improvements in existing physics, and the embedding of the JETSET model etc.. Therefore we update the PACIAE model to the new version of PACIAE 2.0 based on the PYTHIA 6.4 in this paper. In addition, some improvements in physics have been introduced in this new version.

Depends on the problem studied.

Running time:
  • Running 1000 events for inelastic pp collisions at √s=200 GeV by program PACIAE 2.0a to reproduce PHOBOS data of rapidity density at mid-rapidity, dNch/dy=2.25+0.37-0.30 [1], takes ≈ 3 minutes.
  • Running 0-6% most central Au+Au collision at √sNN=200 GeV by program PACIAE 2.0b and PACIAE 2.0c to reproduce PHOBOS data of charged multiplicity of 5060 [2] takes ≈ 13 seconds/event and ≈ 265 seconds/event, respectively.

[1] B. Alver, et al., PHOBOS Collab. arXiv:1011.1940v1, Phys. Rev. C 83, 024913 (2011)
[2] B.B. Back, et al., PHOBUS Collab. Phys. Rev. Lett. 91, 052303 (2003)