Azimuthal correlation anisotropies in p+p collisions simulated using Pythia  

作　　者：Manuel Sebastian Torres Yicheng Feng Fuqiang Wang 冯毅程;王福强

机构地区：[1]Department of Physics,Universidad Nacional de Colombia,Bogota D.C.111321,Colombia [2]Department of Physics and Astronomy,Purdue University,West Lafayette,Indiana 47907,USA

出　　处：《Chinese Physics C》2025年第4期57-67,共11页中国物理C(英文版)

基　　金：Supported in part by the U.S.Department of Energy(DE-SCo012910)。

摘　　要：Stimulated by a keen interest in possible collective behavior in high-energy proton-proton and protonnucleus collisions,we study two-particle angular correlations in pseudorapidity and azimuthal differences in simulated p+p interactions using the Pythia 8 event generator.Multi-parton interactions and color connection are included in these simulations,which have been perceived to produce collectivity in final-state particles.Meanwhile,contributions from genuine few-body nonflow correlations,not of collective flow behavior,are known to be severe in these small-system collisions.We present our Pythia correlation studies pedagogically and report azimuthal harmonic anisotropies analyzed using several methods.We observe anisotropies in these Pythia simulated events qualitatively and semi-quantitatively,similar to experimental data.Our findings highlight the delicate nature of azimuthal anisotropies in small-system collisions and provide a benchmark that can aid in improving data analysis and interpreting experimental measurements in small-system collisions.

关 键 词：p+p collisions azimuthal anisotropy Pythia particle correlations nonflow 

分 类 号：O572.2[理学—粒子物理与原子核物理]