Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.262001
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Funding
- National Science Centre (Poland) Grant SONATA BIS [2016/22/E/ST2/00013]
- U.S. Department of Energy Early Career Award [DE-SC0020405]
- Cyprus Research and Innovation Foundation [POST-DOC/0718/0100]
- DFG [392578569]
- European Joint Doctorate program STIMULATE of the European Union's Horizon 2020 research and innovation programme [765048]
- Office of Science of the U.S. Department of Energy
- PLGrid Infrastructure (Prometheus supercomputer at AGH Cyfronet in Cracow)
- Extended Twisted Mass Collaboration on the KNL (A2) Partition of Marconi at CINECA, through the Prace project [Pra13_3304]
- U.S. Department of Energy (DOE) [DE-SC0020405] Funding Source: U.S. Department of Energy (DOE)
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We present the first calculation of the x dependence of the proton generalized parton distributions (GPDs) within lattice QCD. Results are obtained for the isovector unpolarized and helicity GPDs. We compute the appropriate matrix elements of fast-moving protons coupled to nonlocal operators containing a Wilson line. We present results for proton momenta 0.83,1.25,1.67 GeV, and momentum transfer squared 0.69,1.38 GeV2. These combinations include cases with zero and nonzero skewness. The calculation is performed using one ensemble of two degenerate mass light quarks, a strange quark, and a charm quark of maximally twisted mass fermions with a clover term. The lattice results are matched to the light-cone GPDs using one-loop perturbation theory within the framework of large momentum effective theory. The final GPDs are given in the (MS) over bar scheme at a scale of 2 GeV.
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