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DTSTART:20190331T010000
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DTSTART:20191027T010000
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DTSTART;TZID=Europe/Rome:20190312T143000
DTEND;TZID=Europe/Rome:20190312T153000
DTSTAMP:20260422T065103
CREATED:20190201T184747Z
LAST-MODIFIED:20190319T184746Z
UID:17533-1552401000-1552404600@w3.lnf.infn.it
SUMMARY:Hadron Electromagnetic Form Factors
DESCRIPTION:Electromagnetic form factors give Lorentz invariant information about the electromagnetic charge distributions inside hadrons. They are thus a key probe of the dynamics of QCD in the low energy\, non-perturbative regime. Importantly\, it is well known that due to its characteristically light mass\, the pion plays an important role in low energy observables. In particular\, the effects of implementing pion loop corrections at the hadron level (as opposed to the quark level) will be discussed. I will show results for electromagnetic form factors calculated in the NJL Model\, and in particular\, that one obtains am improved prediction of the predicted Hyperon Magnetic moment when the pion loop effects are implemented in this way.\nOne important input into this calculation is the pion form factor itself. Modern extractions of the pion form factor for moderate values of the photon virtuality (above about 0.3 GeV^2) arise from a model dependent extraction from pion electro-production data. In the second half of the talk\, a simple model of pion electro-production\, will be described and used to examine the model dependence of the extraction method. In the context of this simple model\, the extracted form factor is systematically overestimated.
URL:/event/hadron-electromagnetic-form-factors/
LOCATION:Aula Leale\, Via Enrico Fermi\, 40\, Frascati\, Roma\, 00044\, Italia
CATEGORIES:Seminari Gruppo 3
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