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Nucleon strange electromagnetic form factors
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Nucleon strange electromagnetic form factors
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The role of the strange quarks on the low-energy interactions of the proton can be probed through the strange electromagnetic form factors. Knowledge of these form factors provides essential input for parity-violating processes and contributes to the understanding of the sea quark dynamics. We determine the strange electromagnetic form factors of the nucleon within the lattice formulation of Quantum Chromodynamics using simulations that include light, strange and charm quarks in the sea all tuned to their physical mass values. We employ state-of-the-art techniques to accurately extract the form factors for values of the momentum transfer square up to 0.8~GeV$^2$. We find that both the electric and magnetic form factors are statistically non-zero. We obtain for the strange magnetic moment $\mu^s=-0.017(4)$, the strange magnetic radius $\langle r^2_M \rangle^s=-0.015(9)$~fm$^2$, and the strange charge radius $\langle r^2_E \rangle^s=-0.0048(6)$~fm$^2$.
Forward citations
Cited by 4 Pith papers
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Ab initio calculations of parity-violating electron scattering off $^{48}$Ca and $^{208}$Pb
Ab initio chiral EFT calculations of parity-violating asymmetries for 48Ca and 208Pb show mild tension with data and infer a neutron skin of 0.187(25)(18) fm for 208Pb.
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Radiative corrections in neutral-current (anti)neutrino elastic scattering at $\text{GeV}$ energies I: Nucleon targets
Radiative corrections to neutral-current (anti)neutrino-nucleon elastic scattering are computed within low-energy EFT and reach a few percent, comparable to the strange-quark effects they must be disentangled from.
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A relativistic mechanism for the enhanced isovector spin-orbit interaction suggested by parity-violating electron scattering experiments
An enhanced isovector tensor coupling in a covariant density functional fits both PREX-II and CREX weak-charge form-factor differences, acting through a strong isovector spin-orbit interaction.
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Nucleon strange electromagnetic form factors using $N_f=2+1+1$ twisted-mass fermions at the physical point
Continuum-extrapolated strange electric and magnetic radii plus strange magnetic moment of the nucleon are obtained from lattice QCD at the physical pion mass using Nf=2+1+1 twisted-mass fermions.
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