Zemach and Friar radii of the proton and neutron from lattice QCD
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| Format: | Preprint |
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2023
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| _version_ | 1866911959790649344 |
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| author | Djukanovic, Dalibor von Hippel, Georg Meyer, Harvey B. Ottnad, Konstantin Salg, Miguel Wittig, Hartmut |
| author_facet | Djukanovic, Dalibor von Hippel, Georg Meyer, Harvey B. Ottnad, Konstantin Salg, Miguel Wittig, Hartmut |
| contents | We present the first lattice-QCD result for the Zemach and Friar radii of the proton and neutron. Our calculation includes both quark-connected and -disconnected diagrams and assesses all sources of systematic uncertainties arising from excited-state contributions, finite-volume effects and the continuum extrapolation. At the physical point, we obtain for the proton $r_Z^p = ( 1.013 \pm 0.010\ (\mathrm{stat}) \pm 0.012\ (\mathrm{syst}) )~\mathrm{fm}$ and $r_F^p = ( 1.301 \pm 0.012\ (\mathrm{stat}) \pm 0.014\ (\mathrm{syst}) )~\mathrm{fm}$. These numbers suggest small values of the Zemach and Friar radii of the proton, but are compatible with most of the experimental studies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2309_17232 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Zemach and Friar radii of the proton and neutron from lattice QCD Djukanovic, Dalibor von Hippel, Georg Meyer, Harvey B. Ottnad, Konstantin Salg, Miguel Wittig, Hartmut High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory We present the first lattice-QCD result for the Zemach and Friar radii of the proton and neutron. Our calculation includes both quark-connected and -disconnected diagrams and assesses all sources of systematic uncertainties arising from excited-state contributions, finite-volume effects and the continuum extrapolation. At the physical point, we obtain for the proton $r_Z^p = ( 1.013 \pm 0.010\ (\mathrm{stat}) \pm 0.012\ (\mathrm{syst}) )~\mathrm{fm}$ and $r_F^p = ( 1.301 \pm 0.012\ (\mathrm{stat}) \pm 0.014\ (\mathrm{syst}) )~\mathrm{fm}$. These numbers suggest small values of the Zemach and Friar radii of the proton, but are compatible with most of the experimental studies. |
| title | Zemach and Friar radii of the proton and neutron from lattice QCD |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2309.17232 |