Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-02-28
JHEP 0503 (2005) 012
Physics
High Energy Physics
High Energy Physics - Phenomenology
Replaced Version. An error has been corrected in the numerical evaluation of the Pauli form factor. This changes the results f
Scientific paper
10.1088/1126-6708/2005/03/012
The electromagnetic form factors of the nucleon, in the space-like region, are determined from three-point function Finite Energy QCD Sum Rules. The QCD calculation is performed to leading order in perturbation theory in the chiral limit, and to leading order in the non-perturbative power corrections. The results for the Dirac form factor, $F_1(q^2)$, are in very good agreement with data for both the proton and the neutron, in the currently accessible experimental region of momentum transfers. This is not the case, though, for the Pauli form factor $F_2(q^2)$, which has a soft $q^2$-dependence proportional to the quark condensate $<0|\bar{q}q|0>$.
Castillo Horacio
Dominguez Cesareo A.
Loewe Marcelo
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