Electromagnetic form factors of the Delta baryon - High Energy Physics - LatticeReport as inadecuate




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Abstract: We develop a methodology that enables us to extract accurately theelectromagnetic Delta form factors and their momentum dependence. We test ourapproach in the quenched approximation as a preparation for a study usingdynamical fermions. Our calculation of the four form factors covers pion massesbetween about 410 MeV and 560 MeV on lattices with a size of 2.9 fm and alattice spacing 0.09 fm. From the form factors we are able to obtain estimatesof the magnetic moment and the charge radius of the Delta, which we compare toexisting experimental and theoretical results.Our non-zero result for theelectric quadrupole form factor signals a deformation of the Delta, pointing toan oblate charge distribution.



Author: Constantia Alexandrou, Tomasz Korzec, Theodoros Leontiou, John W. Negele, Antonios Tsapalis

Source: https://arxiv.org/



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