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

Abstract
We have updated the parton and hadron cascade model PACIAE 2.0 (cf. Ben-Hao Sa, Dai-Mei Zhou, Yu-Liang Yan, Xiao-Mei Li, Sheng-Qin Feng, Bao-Guo Dong, Xu Cai, Comput. Phys. Comm. 183 (2012) 333.) to the new issue of PACIAE 2.1. The PACIAE model is based on PYTHIA. In the PYTHIA model, once the hadron transverse momentum p T is randomly sampled in the string fragmentation, the p x and p y components are originally put on the circle with radius p T randomly. Now it is put on the circumference o...

Title of program: PACIAE version 2.1
Catalogue Id: AEKI_v2_0

Nature of problem
PACIAE is based on PYTHIA. In the PYTHIA model, once the generated particle/parton transverse momentum (p T ) is randomly sampled, the p x and p y components are randomly placed on the circle with radius of p T . This strongly cancels the final state transverse momentum asymmetry developed from the initial spatial asymmetry.

Versions of this program held in the CPC repository in Mendeley Data
AEKI_v1_0; PACIAE version 2.0; 10.1016/j.cpc.2011.08.021
AEKI_v2_0; PACIAE version 2.1; 10.1016/j.cpc.2012.12.026
AEKI_v2_2; PACIAE version 2.2; 10.1016/j.cpc.2015.01.022

This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)