Drawing insights from pion parton distributions  

作　　者：Minghui Ding Khépani Raya Daniele Binosi Lei Chang C.D.Roberts S.M.Schmidt 丁明慧;Khépani Raya;Daniele Binosi;常雷;C.D.Roberts;S.M.Schmidt(School of Physics,Nankai University,Tianjin 300071,China;European Centre for Theoretical Studies in Nuclear Physics and Related Areas(ECT*)and Fondazione Bruno Kessler Villa Tambosi,Strada delle Tabarelle 286,I-38123 Villazzano(TN),Italy;School of Physics,Nanjing University,Nanjing,Jiangsu 210093,China;Institute for Nonperturbative Physics,Nanjing University,Nanjing,Jiangsu 210093,China;Institute for Advanced Simulation,Forschungszentrum Jülich and JARA,D-52425 Jülich,Germany)

机构地区：[1]School of Physics,Nankai University,Tianjin 300071,China [2]European Centre for Theoretical Studies in Nuclear Physics and Related Areas(ECT^*)and Fondazione Bruno Kessler Villa Tambosi,Strada delle Tabarelle 286,I-38123 Villazzano(TN),Italy [3]School of Physics,Nanjing University,Nanjing,Jiangsu 210093,China [4]Institute for Nonperturbative Physics,Nanjing University,Nanjing,Jiangsu 210093,China [5]Institute for Advanced Simulation,Forschungszentrum Jülich and JARA,D-52425 Jülich,Germany

出　　处：《Chinese Physics C》2020年第3期12-17,共6页中国物理C（英文版）

基　　金：Supported by the Chinese Government’s Thousand Talents Plan for Young Professionals;Jiangsu Province Hundred Talents Plan for Professionals;Forschungszentrum Jülich GmbH

摘　　要：A symmetry-preserving continuum approach to the two valence-body bound-state problem is used to calculate the valence, glue and sea distributions within the pion; unifying them with, inter alia, electromagnetic pion elastic and transition form factors. The analysis reveals the following momentum fractions at the scale ζ2:= 2GeV :〈xvalence〉 = 0.48（3）, 〈xglue〉 = 0.41（2）, 〈xsea〉 = 0.11（2）;and despite hardening induced by the emergent phenomenon of dynamical chiral symmetry breaking, the valence-quark distribution function, qπ（x）, exhibits the x ≈ 1 behaviour predicted by quantum chromodynamics（QCD）. After evolution to o ζ = 5.2 GeV, the prediction for qπ（x） matches that obtained using lattice-regularised QCD. This confluence should both stimulate improved analyses of existing data and aid in planning efforts to obtain new data on the pion distribution functions.A symmetry-preserving continuum approach to the two valence-body bound-state problem is used to calculate the valence,glue and sea distributions within the pion;unifying them with,inter alia,electromagnetic pion elastic and transition form factors.The analysis reveals the following momentum fractions at the scale ζ2:=2GeV:〈xvalence〉=0.48(3),〈xglue〉=0.41(2),〈xsea〉=0.11(2);and despite hardening induced by the emergent phenomenon of dynamical chiral symmetry breaking,the valence-quark distribution function,q^π(x),exhibits the x≈1 behaviour predicted by quantum chromodynamics(QCD).After evolution to ζ=5.2 GeV,the prediction for q^π(x)matches that obtained using lattice-regularised QCD.This confluence should both stimulate improved analyses of existing data and aid in planning efforts to obtain new data on the pion distribution functions.

关 键 词：PION parton distribution bound state Dyson-Schwinger equations 

分 类 号：O572.33[理学—粒子物理与原子核物理]