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Flavor content of nucleon form factors | | R. Bijker
; E. Santopinto
; | | Date: |
16 Mar 2007 | | Abstract: | The flavor content of nucleon form factors is analyzed using two different theoretical approaches. The first is based on a phenomenological two-component model in which the external photon couples to both an intrinsic three-quark structure and a meson cloud via vector-meson dominance. The flavor content of the nucleon form factors is extracted without introducing any additional parameter. A comparison with recent data from parity-violating electron scattering experiments shows a good overall agreement for the strange form factors.
A more microscopic approach is that of an unquenched quark model proposed by Geiger and Isgur which is based on valence quark plus glue dominance to which quark-antiquark pairs are added in perturbation. In the original version the importance of $s ar{s}$ loops in the proton was studied. Here we present the formalism for a new generation of unquenched quark models which, among other extensions, includes the contributions of $u ar{u}$ and $d ar{d}$ loops. Finally, we discuss some preliminary results in the closure limit. | | Source: | arXiv, nucl-th/0703053 | | Services: | Forum | Review | PDF | Favorites | |
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