Nucleon spin structure II: Spin structure function g₁^p at small x

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 #hep-ph

paper · pdf · doi:10.48550/arxiv.1503.02251

24 pages. 9 figures

arxiv created 2015/03/08 · openalex publication_date 2015/03/08 · arxiv updated 2015/03/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The spin structure function g₁^p of the proton is studied in a two component framework, where the perturbative evolution of parton distributions and nonperturbative vector meson dominance model are used. We predict the g₁^p asymmetric behavior at small x from lower Q² to higher Q². We find that the contribution of the large gluon helicity dominates g₁^p at x>10^-3 but mixed with nonperturbative component which complicates the asymptomatic behavior of g₁^p at x<10^-3. The results are compatible with the data including the HERA early estimations and COMPASS new results. The predicted strong Q²- and x-dependence of g₁^p at 0.01<Q²<3 GeV² and x<0.1 can be checked on the next Electron-Ion Collider.

Citations

• eRHIC Design Study: An Electron-Ion Collider at BNL

Related

• QCD Predictions for g₁^p at Small x Incorporating Double ln²(1/x) Resummation
• Nucleon Spin Structure Functions
• Description of the spin structure function g₁ at arbitrary x and arbitrary Q²
• Nucleon Spin Structure and Parton Distribution Functions
• Spin Structure Functions of the Nucleon