Moments of nucleon generalized parton distributions from lattice QCD simulations at physical pion mass
| Autor: | Alexandrou, C., Bacchio, S., Constantinou, M., Dimopoulos, P., Finkenrath, J., Frezzotti, R., Hadjiyiannakou, K., Jansen, Karl, Kostrzewa, B., Koutsou, G., Lauer, C., Urbach, C. |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
form factor
finite size: effect momentum transfer isovector lattice field theory parton: distribution function axial-vector helicity nucleon: generalized parton distribution renormalization quark: mass: twist quark: flavor: 4 quark: flavor: 2 quantum chromodynamics excited state ground state quark: mass dependence numerical calculations charm vector lattice |
| DOI: | 10.3204/pubdb-2020-01424 |
| Popis: | Physical review / D D 101(3), 034519 (2020). doi:10.1103/PhysRevD.101.034519 We present results for the moments of nucleon isovector vector and axial generalized parton distribution functions computed within lattice QCD. Three ensembles of maximally twisted mass clover-improved fermions simulated with a physical value of the pion mass are analyzed. Two of these ensembles are generated using two degenerate light quarks. A third ensemble is used having, in addition to the light quarks, strange and charm quarks in the sea. A careful analysis of the convergence to the ground state is carried out that is shown to be essential for extracting the correct nucleon matrix elements. This allows a controlled determination of the unpolarized, helicity, and tensor second Mellin moments. The vector and axial-vector generalized form factors are also computed as a function of the momentum transfer square up to about 1 GeV2. The three ensembles allow us to check for unquenching effects and to assess lattice finite volume effects. Published by Inst.302363, Melville, NY |
| Databáze: | OpenAIRE |
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