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Seminário do GRHAFITE com Jesuel Leal Jr. (IFT-UNESP)

Data do Evento: 
21/08/2018 - 17:00 até 19:00

Seminário do Grupo de Hádrons e Física Teórica (GRHAFITE) – FEP – FNC

"QCD Sum Rules for the ∆ Isobar in Nuclear Matter"

Palestrante: Jesuel Marques Leal Junior (IFT-UNESP). 

Dia: 21 de agosto, terça-feira, às 17h.

Local: Ed. Principal, Ala 2, Sala 335, IFUSP.

Abstract:

We study the properties of the ∆ isobar in the symmetric and asymmetric nuclear matter using the QCD sum rules approach based on the energy dispersion relation. Allowing for different continuum thresholds for the polarization tensors with different dimensions, we find stable masses for the ∆ in both the vacuum and the medium. Compared to the nucleon case, we find that the vector repulsion is smaller for the ∆ while the scalar attraction is similar (75 MeV vector repulsion and 200 MeV scalar attraction in the symmetric matter). Also the isospin dependence of the quasiparticle energy, which mainly comes from the vector self energy, is quite weak. We also allow for an explicit π − N continuum contribution to the polarization function, but find its effect to be minimal. Phenomenological consequences of our results are discussed.

Data de Término: 
21/08/2018 - 17:00

Desenvolvido por IFUSP