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Lattice results for the longitudinal spin structure and color forces on quarks in a nucleon

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Bürger, S. ; Wurm, T. ; Löffler, M. ; Göckeler, M. ; Bali, Gunnar S. ; Collins, S. ; Schäfer, Andreas ; Sternbeck, A.
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Date of publication of this fulltext: 02 Feb 2023 07:50


Using lattice QCD, we calculate the twist-2 contribution a(2) to the third Mellin moment of the spin structure functions g(1) and g(2) in the nucleon. In addition we evaluate the twist-3 contribution d(2). Our computations make use of N-f = 2 + 1 gauge field ensembles generated by the Coordinated Lattice Simulations effort. Neglecting quark-line disconnected contributions we obtain as our best ...


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