Abstract
We study the effects of the | qqq q\bar{q} > component of the hadronic wave function on the description of the electromagnetic structure of the nucleon. Starting with a qqq baryonic wave function which describes the baryonic and mesonic low energy spectrum, the extra q\bar{q} pair is generated through a relativistic version of the 3P_0 model. It is shown that this model leads to a renormalization of the quark mass that allows one to construct a conserved electromagnetic current. We conclude that these dynamical relativistic corrections play an important role in reproducing the Q2 dependence of the electromagnetic form factors at low Q^2.
Highlights
Electromagnetic processes constitute a basic tool to investigate the baryon structure since the photon couples to the spin and flavor of the constituent quarks, revealing their spin-flavor correlations inside the baryons
From a theoretical point of view, most analyses rely on the use of the non-relativistic quark model [2] in spite of the fact that for the low-lying nonstrange resonances the velocity of the quarks inside the baryons may be close to c
By proceeding in the same way for the electromagnetic transition operator a first simplified model for the photo and electroproduction amplitudes of N(1440) was presented in [11]. These results suggest that the explicit contribution of the baryon mesonic cloud is an essential ingredient for the description of transition processes from a non-relativistic quark model scheme
Summary
Electromagnetic processes constitute a basic tool to investigate the baryon structure since the photon couples to the spin and flavor of the constituent quarks, revealing their spin-flavor correlations inside the baryons. By proceeding in the same way for the electromagnetic transition operator a first simplified model for the photo and electroproduction amplitudes of N(1440) was presented in [11] These results suggest that the explicit contribution of the baryon mesonic cloud (taken implicitly into account in the baryon spectrum through the effective parameters and/or interactions of the potential) is an essential ingredient for the description of transition processes from a non-relativistic quark model scheme. On the other hand the Q2 dependence of this factor makes the magnetic form factor go faster to zero when increasing Q2 as compared to the (p/m) case It is clear the insufficiency of the EEM mechanism when combined with a spectroscopic quark model to explain the data, even if some relativistic kinematic corrections are included as in Eq (2)
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