Yu-Liang Yan

PACIAE 2.0: An updated parton and hadron cascade model (program) for the relativistic nuclear collisions

Abstract We have updated the parton and hadron cascade model PACIAE for the relativistic nuclear collisions, from based on JETSET 6.4 and PYTHIA 5.7 to based on PYTHIA 6.4, and renamed as PACIAE 2.0. The main physics concerning the stages of the parton initiation, parton rescattering, hadronization, and hadron rescattering were discussed. The structures of the programs were briefly explained. In addition, some calculated examples were compared with the experimental data. It turns out that this model (program) works well. Program summary Program title: PACIAE version 2.0 Catalogue identifier: AEKI_v1_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEKI_v1_0.html Program obtainable from: CPC Program Library, Queenʼs University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 297u2009523 No. of bytes in distributed program, including test data, etc.: 2u2009051u2009274 Distribution format: tar.gz Programming language: FORTRAN 77 Computer: DELL Studio XPS and others with a FORTRAN 77 or GFORTRAN compiler Operating system: Unix/Linux RAM: 1 G words Word size: 64 bits 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 p T suppression, the jet quenching (energy loss), and the eccentricity scaling of v 2 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. Restrictions: 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, d N ch / d y = 2.25 − 0.30 + 0.37 [1], takes ≈3 minutes. • Running 0–6% most central Auxa0+xa0Au collision at s NN = 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. References: [1] B. Alver, et al., PHOBOS Collab., Phys. Rev. C 83 (2011) 024913, arXiv:1011.1940v1 . [2] B.B. Back, et al., PHOBUS Collab., Phys. Rev. Lett. 91 (2003) 052303.

Higher Moment Singularities Explored by Net Proton Non-statistical Fluctuations

We use the non-statistical fluctuation instead of the full one to explore the higher moment singularities of net proton event distributions in the relativistic Au+Au collisions at

Charged particle elliptic flow in p+p collisions at LHC energies in a parton and hadron cascade model PACIAE

sqrt{s_{NN}}

Antimatter production in central Au+Au collisions at sNN=200 GeV

from 11.5 to 200 GeV calculated by the parton and hadron cascade model PACIAE. The PACIAE results of mean (

PACIAE model predictions for Pb+Pb collisions at LHC compared to the Au+Au collisions at RHIC

M

PACIAE 2.1: An updated issue of the parton and hadron cascade model PACIAE 2.0

), variance (

Predictions for the production of light nuclei in pp collisions at s=7 and 14 TeV

sigma^2

An upgraded issue of the parton and hadron cascade model, PACIAE 2.2☆

), skewness (

PACIAE model capability in describing net proton moments

S

RE-EXAMINATION FOR THE CALCULATION OF ELLIPTIC FLOW AND OTHER FOURIER HARMONICS

), and kurtosis (