Bali, Gunnar S. and Collins, Sara and Glaessle, Benjamin and Goeckeler, Meinulf and Najjar, Johannes and Roedl, Rudolf H. and Schaefer, Andreas and Schiel, Rainer W. and Soeldner, Wolfgang and Sternbeck, Andre (2015) Nucleon isovector couplings from N-f=2 lattice QCD. PHYSICAL REVIEW D, 91 (5): 054501. ISSN 2470-0010, 2470-0029
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We compute the axial, scalar, tensor and pseudoscalar isovector couplings of the nucleon as well as the induced tensor and pseudoscalar charges in lattice simulations with N-f = 2 mass-degenerate non-perturbatively improved Wilson-Sheikholeslami-Wohlert fermions. The simulations are carried out down to a pion mass of 150 Me V and linear spatial lattice extents of up to 4.6 fm at three different lattice spacings ranging from approximately 0.08 fm to 0.06 fm. Possible excited state contamination is carefully investigated and finite volume effects are studied. The couplings, determined at these lattice spacings, are extrapolated to the physical pion mass. In this limit we find agreement with experimental results, where these exist, with the exception of the magnetic moment. A proper continuum limit could not be performed, due to our limited range of lattice constants, but no significant lattice spacing dependence is detected. Upper limits on discretization effects are estimated and these dominate the error budget.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHIRAL PERTURBATION-THEORY; FORM-FACTORS; SCATTERING; DECAY; MASS; RENORMALIZATION; PRECISION; DYNAMICS; CHARGE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Gunnar Bali |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Jul 2019 07:45 |
| Last Modified: | 24 Jul 2019 07:45 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5805 |
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