Constraints ofξ-moments computed using QCD sum rules on pion distribution amplitude models  

作　　者：钟涛 朱志豪 付海冰 Tao Zhong;Zhi-Hao Zhu;Hai-Bing Fu(School of physics,Henan Normal University,Xinxiang 453007,China;Department of Physics,Guizhou Minzu University,Guiyang 550025,China;Department of Physics,Chongqing University,Chongqing 401331,China)

机构地区：[1]School of physics,Henan Normal University,Xinxiang 453007,China [2]Department of Physics,Guizhou Minzu University,Guiyang 550025,China [3]Department of Physics,Chongqing University,Chongqing 401331,China

出　　处：《Chinese Physics C》2023年第1期125-134,共10页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(12265009,12265010,12175025,12147102);the Project of Guizhou Provincial Department of Science and Technology(ZK[2021]024);the Project of Guizhou Provincial Department of Education(KY[2021]030);the Chongqing Graduate Research and Innovation Foundation(ydstd1912)。

摘　　要：To date,the behavior of the pionic leading-twist distribution amplitude(DA)φ2;π(x,μ)-which is a universal physical quantity and is introduced into high-energy processes involving pions based on the factorization theorem-is not completely consistent.The form ofφ2;π(x,μ)is usually described by phenomenological models and constrained by the experimental data on exclusive processes containing pions or the moments computed using QCD sum rules and the lattice QCD theory.Evidently,an appropriate model is extremely important to determine the exact behavior ofφ2;π(x,μ).In this paper,by adopting the least squares method to fit theξ-moments calculated using QCD sum rules based on the background field theory,we perform an analysis on several commonly used models of the pionic leading-twist DA in the literature;these include the truncation form of the Gegenbauer polynomial series,the light-cone harmonic oscillator model,the form extracted from the Dyson-Schwinger equations,the model from the light-front holographic AdS/QCD,and a simple power-law parametrization form.

关 键 词：pion distribution amplitude QCD sum rules light-cone harmonic oscillator model 

分 类 号：O572.243[理学—粒子物理与原子核物理]