Lin, Huey-Wen and Chen, Jiunn-Wei and Ishikawa, Tomomi and Zhang, Jian-Hui (2018) Improved parton distribution functions at the physical pion mass. PHYSICAL REVIEW D, 98 (5): 054504. ISSN 2470-0010, 2470-0029
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We present the first lattice results on isovector unpolarized and longitudinally polarized parton distribution functions (PDFs) at physical pion mass. The PDFs are obtained using the large-momentum effective field theory (LaMET) framework where the full Bjorken-x dependence of finite-momentum PDFs, called "quasi-PDFs," can be calculated on the lattice. The quasi-PDF nucleon matrix elements are renormalized nonperturbatively in the RI/MOM-scheme. However, the recent renormalized quasi-PDFs suffer from unphysical oscillations that alter the shape of the true distribution as a function of Bjorken-x. In this paper, we propose two possible solutions to overcome this problem and demonstrate the efficacy of the methods on the 2 + 1 + 1-flavor lattice data at physical pion mass with lattice spacing 0.09 fm and volume (5.76 fm)(3).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LATTICE QCD; PDFS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Dec 2019 09:17 |
| Last Modified: | 13 Dec 2019 09:17 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13879 |
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