''Consistent determination of properties of the Delta(1232 MeV) resonance''

A. MARIANO

Zacatecas, Mexico

Congreso; LI Congreso Nacional de Física y II Congreso Latinoamericano de Física; 2008

Sociedad Mexicana de Física

Quantum Chromodynamics (QCD) is considered the basic theory ofstrong interactions from which the hadron structure and hadron interactionsshould be described. Nevertheless at intermediates energies aperturbation approach is not adequate, and then we must relay oneffective treatments where baryons and mesons are main degrees of freedom.There is a group of processes where the lowestlying $J^pi T={3/2^+ 3/2}$ nucleon (N) resonance$Delta(1232mbox{MeV})$ is excited as in $pi N ightarrow  pi´ N´$ scattering,  $pi N ightarrow  pi´ N´ gamma$bremsstrahlung, $gamma N ightarrow pi N´$ photoproduction, $e N ightarrow e´ pi N´$ electroproduction,and $ u_l N ightarrow l pi N´$ weak pion-production.The cross sections for these processes   exhibit a resonant plus background structure.The contributions coming from the non resonant amplitudes are  rough similarly described  in the different models,nevertheless exist different treatments to calculate the resonant amplitude.From the point of view of consistency, should be desirable develop a model for describing the $Delta(1232mbox{MeV})$resonance  and its interactions, capable of calculate the resonant contribution on the same footing for all the mentioned processes.