Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-05-23
J.Phys. G30 (2004) 1407-1426
Physics
Nuclear Physics
Nuclear Theory
25 pages, RevTex, 8 figures
Scientific paper
10.1088/0954-3899/30/10/008
The electromagnetic form factors of the nucleon are calculated at order $q^4$ in the relativistic formulation of baryon chiral perturbation theory. In order to obtain a consistent power counting for the renormalized diagrams we make use of the extended on-mass-shell renormalization scheme which we have discussed in a recent paper. We analyze the Dirac and Pauli form factors, $F_1$ and $F_2$, as well as the electric and magnetic Sachs form factors, $G_E$ and $G_M$. Our results are compared with those obtained in the heavy-baryon approach and in the (relativistic) infrared regularization. In addition, the Sachs form factors are compared with experimental data. We confirm previous findings that a one-loop calculation of the electromagnetic form factors does not generate sufficient curvature for the Sachs form factors $G^p_E$, $G^p_M$, and $G^n_M$. Moreover, the electric form factor of the neutron is very sensitive to higher-order contributions.
Fuchs Thomas
Gegelia Jambul
Scherer Stefan
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