Higher twist analysis of the proton g1 structure function

• Published in: Physics letters. B Vol. 609; no. 3-4; pp. 259 - 264
• Main Authors: Osipenko, M., Melnitchouk, W., Simula, S., Bosted, P., Burkert, V., Christy, M.E., Griffioen, K., Keppel, C., Kuhn, S.E.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10.03.2005; Elsevier Science
• Subjects: Exact sciences and technology; Experimental tests; General properties of qcd (dynamics, confinement, etc.); Photon and charged-lepton interactions with hadrons; Physics; Quantum chromodynamics; Specific reactions and phenomenology; Specific theories and interaction models; particle systematics; The physics of elementary particles and fields; Total and inclusive cross sections (including deep-inelastic processes); 12.38.Aw; 12.38.Qk; 13.60.Hb; Operator; Protons; Structure functions; Polarizability; Matrix elements; Color
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2005.01.071

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)±0.0240.021(sys) and χB=−0.013∓0.007(stat)∓0.0120.010(sys), respectively.