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)

摘要
本课题组已对基于PYTHIA框架的粒子/强子级联模型PACIAE 2.0（参见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）进行了升级，形成了PACIAE 2.1的新版本。PACIAE模型构建于PYTHIA模型之上。在PYTHIA模型中，一旦生成粒子/强子横动量（pT）进行随机抽样后，其px和py分量原本是随机分布在以pT为半径的圆周上。现将其放置于pT周长的圆周上...
程序名称：PACIAE版本2.1
目录编号：AEKI_v2_0
问题性质
PACIAE模型以PYTHIA为基础。在PYTHIA模型中，一旦生成的粒子/强子横动量（pT）被随机抽样，其px和py分量则被随机布置于以pT为半径的圆周上。这一设置有效地抵消了由初始空间不均匀性引起的最终态横动量不均匀性。
CPC资源库中Mendeley数据存储的此程序版本
AEKI_v1_0；PACIAE版本2.0；10.1016/j.cpc.2011.08.021
AEKI_v2_0；PACIAE版本2.1；10.1016/j.cpc.2012.12.026
AEKI_v2_2；PACIAE版本2.2；10.1016/j.cpc.2015.01.022
本程序已从贝尔法斯特女王大学（1969-2018）所藏的CPC程序库中导入。