Higher twist analysis of the proton g_1 structure function

Abstract

We perform a global analysis of all available spin-dependent proton structure function data, covering a large range of Q^2, 1 < Q^2 < 30 GeV^2, and calculate the lowest moment of the g_1 structure function as a function of Q^2. From the Q^2 dependence of the lowest moment we extract matrix elements of twist-4 operators, and determine the color electric and magnetic polarizabilities of the proton to be χ_E = 0.026 +- 0.015 (stat) + 0.021/-0.024 (sys) and χ_B = -0.013 -+ 0.007 (stat) - 0.010/+0.012 (sys), respectively.

arXiv comment6 pages, 2 figures, to appear in Phys. Lett. B

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• Spin Structure of the Nucleon - Status and Recent Results
• Iterative Monte Carlo analysis of spin-dependent parton distributions
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• Parton momentum and helicity distributions in the nucleon
• Moments of the Spin Structure Functions g_1^p and g_1^d for 0.05 < Q^2 < 3.0 GeV^2
• Measurements of $d_2^n$ and $A_1^n$: Probing the neutron spin structure
• Sum Rules and Moments of the Nucleon Spin Structure Functions
• Target mass corrections revisited
• Global Analysis of Data on the Proton Structure Function g1 and Extraction of its Moments
• Moments of Spin Structure Functions: Sum Rules and Polarizabilities
• A Precision Measurement of the Neutron Twist-3 Matrix Element $d_2^n$: Probing Color Forces
• Higher twists in polarized DIS and the size of the constituent quark
• Target mass corrections and twist-3 in the nucleon spin structure functions
• Target mass corrections to matrix elements in nucleon spin structure functions
• Effect of symmetry breaking of polarized light sea quarks on the nucleon and nuclear structure functions, and sum rules