Bali, Gunnar and Collins, Sara and Goeckeler, Meinulf and Roedl, Rudolf and Schaefer, Andreas and Sternbeck, Andre (2019) Nucleon generalized form factors from two-flavor lattice QCD. PHYSICAL REVIEW D, 100 (1): 014507. ISSN 2470-0010, 2470-0029
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We determine the generalized form factors, which correspond to the second Mellin moment (i.e., the first x-moment) of the generalized parton distributions of the nucleon at leading twist. The results are obtained using lattice QCD with N-f = 2 nonperturbatively improved Wilson fermions, employing a range of quark masses down to an almost physical value with a pion mass of about 150 MeV. We also present results for the isovector quark angular momentum and for the first x-moment of the transverse quark spin density. We compare two different fit strategies and find that directly fitting the ground state matrix elements to the functional form expected from Lorentz invariance and parametrized in terms of form factors yields comparable, and usually more stable results than the traditional approach where the form factors are determined from an overdetermined linear system based on the fitted matrix elements.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HADRON STRUCTURE; QUARK MASS; RENORMALIZATION; (MS)OVER-BAR; DENSITIES; INVARIANT; LIMIT; SPIN; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Tilo Wettig Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Gunnar Bali |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Apr 2020 08:20 |
| Last Modified: | 07 Apr 2020 08:20 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26625 |
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