Abstract
It is shown that the amplitude for the direct knockout of ρ 0 mesons plays an important role at energies W above the resonance region, W ≳ 2 GeV, and rather high values of Q 2 ≳ 1.5−2 GeV2/c 2 and that it corresponds to the t pole in the channel of the virtual decay p → p + π 0 accompanied by quark-spin flip upon momentum transfer to the meson, π 0 + γ* T → ρ 0. The contributions of several scalar mesons (p → p + f 0 channel), the contribution of the tensor meson f 2, and effects of the interference between different contributions were taken into account in addition to the contribution of the π 0 meson. The vectorand tensor-meson-dominance models were used to estimate the respective vertex constants. Within the proposed mechanism, the differential cross sections dσ L /dt and dσ T /dt were calculated for several W and Q 2 values at which the respective total cross sections were measured by the CLAS Collaboration. Agreement with data on the transverse part of the total cross section, σ T , was attained, whereby the assumption of a dominant role of magnetic spin transitions in the meson skin of the nucleon under conditions of quasielastic-knockout kinematics is confirmed. At the same time, the contribution of spin-flip transitions is suppressed in the longitudinal part of the cross section, σ L , and this is confirmed by the results of our calculations. The behavior of the differential cross section dσ T /dt is predicted with an eye to future experiments.
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Original Russian Text © I.T. Obukhovsky, V.G. Neudatchin, L.L. Sviridova, D.K. Fedorov, 2010, published in Yadernaya Fizika, 2010, Vol. 73, No. 9, pp. 1602–1616.
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Obukhovsky, I.T., Neudatchin, V.G., Sviridova, L.L. et al. Electroproduction of ρ 0 mesons on protons in quasielastic kinematics at intermediate energies and spin-flip mechanism of direct meson knockout. Phys. Atom. Nuclei 73, 1556–1570 (2010). https://doi.org/10.1134/S1063778810090103
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DOI: https://doi.org/10.1134/S1063778810090103