Proton Spin Structure in the Resonance Region

Abstract

We have examined the spin structure of the proton in the region of the nucleon resonances (1.085 GeV < W < 1.910 GeV) at an average four momentum transfer of Q^2 = 1.3 GeV^2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A_parallel and A_perp to high precision, and extracted the asymmetries A_1 and A_2, and the spin structure functions g_1 and g_2. We found a notably non-zero A_perp, significant contributions from higher-twist effects, and only weak support for polarized quark--hadron duality.

6 pages, 4 figures, REVTeX4, similar to PRL submission, plots colorized and appenix added, v3: minor edit, matches PRL

References in corpus (12)

• Measurements of the $Q^2$-Dependence of the Proton and Neutron Spin Structure Functions g1p and g1n
• Precision Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetries A2
• Polarized Parton Distribution Functions in the Nucleon
• Measurement of the $x$- and $Q^2$-Dependence of the Asymmetry $A_1$ on the Nucleon
• Target Mass Corrections for Polarized Structure Functions and New Sum Rules
• Proton G_E/G_M from beam-target asymmetry
• A high-precision polarimeter
• The origins of quark-hadron duality: How does the square of the sum become the sum of the squares?
• The statistical parton distributions: status and prospects
• Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry $A_1$
• Parton-Hadron Duality in Unpolarised and Polarised Structure Functions
• Positivity constraints and flavor dependence of higher twists

Cited by in corpus (31)

• Spin Structure of the Nucleon - Status and Recent Results
• Theory of the 2S-2P Lamb shift and 2S hyperfine splitting in muonic hydrogen
• Iterative Monte Carlo analysis of spin-dependent parton distributions
• The Spin Structure of the Nucleon
• High precision determination of the $Q^2$-evolution of the Bjorken Sum
• Impact of hadronic and nuclear corrections on global analysis of spin-dependent parton distributions
• Proton structure corrections to electronic and muonic hydrogen hyperfine splitting
• Determination of the Proton Spin Structure Functions for 0.05 < Q^2 < 5 GeV^2 using CLAS
• Moments of the Spin Structure Functions g_1^p and g_1^d for 0.05 < Q^2 < 3.0 GeV^2
• Precision measurements of $g_1$ of the proton and the deuteron with 6 GeV electrons
• Precise Determination of the Deuteron Spin Structure at Low to Moderate $Q^2$ with CLAS and Extraction of the Neutron Contribution
• Baryon Resonance Analysis from SAID
• Probing Quark-Gluon Interactions with Transverse Polarized Scattering
• Quark-hadron duality in neutrino scattering
• Revealing Color Forces with Transverse Polarized Electron Scattering
• Target mass corrections for spin-dependent structure functions in collinear factorization
• Quark-Hadron Duality in Neutron (3He) Spin Structure
• Radiative corrections to semileptonic beta decays: Progress and challenges
• Moments of Spin Structure Functions: Sum Rules and Polarizabilities
• Quark-hadron duality constraints on γZ box corrections to parity-violating elastic scattering
• Bjorken sum rule with hyperasymptotic precision
• Proton Form Factor Ratio, ${\mu }_p{G}_E^p/G_M^p$ from Double Spin Asymmetry
• Resonant contributions to polarized proton structure functions
• The g2p Experiment: A Measurement of the Proton's Spin Structure Functions
• A Threshold Gas Čerenkov Detector for the Spin Asymmetries of the Nucleon Experiment
• Highlights and Perspectives of the JLab Spin Physics Program
• Measurement of the nucleon spin structure functions for 0.01<$Q^2$<1 GeV${}^2$ using CLAS
• The polarized photon distribution function
• Detailed Study of Quark-Hadron Duality in Spin Structure Functions of the Proton and Neutron
• Polarized proton structure in the resonance region
• Hall A Annual Report 2013