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With this value ofm ϱ the theoretical curves of Fig. 1, 2 and 3 are almost unchanged if we take Λ≃1 GeV.
\(\Delta = m_\rho ^M - m_\rho ^E = 20\) MeV is a quite reasonable value to expect. See ref. (5).
As the cut-off Λ might correspond to the opennig of the πϱ and πω channels, perhaps the correction μ-μ0 is in a large part due to different contributions of such channels to the electric and magnetic form factors. In such a case one might represent them for two different cut-offsΛ M andΛ E. However, dynamical calculations are needed in order to estimate such effect.
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Due to the large width of the A1 resonance one expects a shifting of the effective position of the pole.
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Cocho, G. On the electromagnetic and weak form factors of the nucleon. Nuovo Cimento A (1965-1970) 42, 421–425 (1966). https://doi.org/10.1007/BF02717933
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DOI: https://doi.org/10.1007/BF02717933