Abstract

We present the first calculations of the electromagnetic form factors of $^{3}\mathrm{He}$ and $^{3}\mathrm{H}$ within the framework of the Covariant Spectator Theory (CST). This first exploratory study concentrates on the sensitivity of the form factors to the strength of the scalar meson-nucleon off-shell coupling, known from previous studies to have a strong influence on the three-body binding energy. Results presented here were obtained using the complete impulse approximation (CIA), which includes contributions of relativistic origin that appear as two-body corrections in a nonrelativistic framework, such as ``Z-graphs,'' but omits other two and three-body currents. We compare our results to nonrelativistic calculations augmented by relativistic corrections of $\mathcal{O}(v/c){}^{2}$.

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