DATA: 12-03-2019

Speaker: Robert Perry (Adelaide Univ.) 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. One 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.


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12-12-2019: M. Tobar - Precision low energy experiments to test fundamental physics and search for dark matter
12-12-2019: MisuraCC3M@LNL: materiali superconduttivi
11-12-2019: Multiplicity and energy dependence of light charged particle production in ALICE at the LHC
11-12-2019: Double-Logarithmic contribution to Pomeron and application to the photon-photon scattering - Boris Ermolaev
10-12-2019: Dai spazio al tempo
10-12-2019: Machine Learning in High Energy Physics - Tommaso Boccali
10-12-2019: New Space Economy - European Expoforum
09-12-2019: Visita ai laboratori della Sezione INFN di Trieste da parte di studenti del Liceo Scientifico dell' IIS Cattaneo-Dall'Aglio di Castelnovo ne' Monti (RE)





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