2015/03/08 by Wei Zhu, Zhu, Wei, Jianhong Ruan +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1503.02252
openalex publication_date 2015/03/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The generalized Gerasimov-Drell-Hearn (GDH) sum rule is understood based on the polarized parton distributions of the proton with the higher twist contributions. A simple parameterized formula is proposed to clearly present the contributions of different components in proton to Γ1p(Q2). We find that the contribution of quark helicity to Γ1p(Q2) is almost constant (∼ 0.123); the twist-4 effect dominates the suppression of Γ1p(Q2) at Q2<3GeV2, while the twist-6 effect arises a dramatic change of Γ1p(Q2) at Q2<0.3 GeV2, it implies a possible extended objects with size 0.2-0.3~ fm inside the proton.