(x,t)dx (1)
نویسنده
چکیده
Abstract It is suggested that the falloff in Q of the P → ∆ magnetic form factor G∗M is related to the recently observed falloff of the elastic electric form factor GEp/GMp. Calculation is carried out in the framework of a two-body GPD mechanism. The P → ∆(1232) form factor G∗M exhibits a more rapid decrease with respect to Q2 than is typically observed in other baryons [1, 2], such as GMp in elastic scattering from a proton, or A1/2 in the transition P → S11(1535). A recent Jefferson Lab (JLab) measurement [3] finds that the ratio GEp/GMp for elastic scattering falls with Q 2 more rapidly than previously expected. In this note it is suggested that this behavior in GEp/GMp is related to that of G ∗ M . As a basis it is assumed that the form factor is dominated by soft mechanisms, and a GPD-handbag basis [4, 5, 6] is utilized. Form factors are the first moments of the GPDs. For elastic scattering
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