Higher twist analysis of the proton g1 structure function
M. Osipenko, W. Melnitchouk, S. Simula, P. Bosted, V. Burkert, M. E. Christy, K. Griffioen, C. Keppel, S. E. Kuhn
Abstract
We perform a global analysis of all available spin-dependent proton structure function data, covering a large range of Q2, 1 < Q2 < 30 GeV2, and calculate the lowest moment of the g1 structure function as a function of Q2. From the Q2 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 χE = 0.026 +- 0.015 (stat) + 0.021/-0.024 (sys) and χB = -0.013 -+ 0.007 (stat) - 0.010/+0.012 (sys), respectively.
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