Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-31
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 3 figures. Presented at QCD 05: 12th International QCD Conference, Montpellier, France, 4-9 July 2005
Scientific paper
We obtain the electromagnetic form factors of the nucleon, in the space-like region, using three-point function Finite Energy QCD Sum Rules. The QCD calculation is performed to leading order in perturbation theory in the chiral limit, and also to leading order in the non-perturbative power corrections. For the Dirac form factor, $F_1(q^2)$, we get a very good agreement with the data for both the proton and the neutron, in the currently accessible experimental region of momentum transfers. Unfortunately 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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