Photoabsorption off nuclei with self consistent vertex corrections

Abstract

We study photoproduction off nuclei based on a self consistent and covariant many body approach for the pion and isobar propagation in infinite nuclear matter. For the first time the t-channel exchange of an in-medium pion is evaluated in the presence of vertex correction effects consistently. In particular the interference pattern with the s-channel in-medium nucleon and isobar exchange contribution is considered. Electromagnetic gauge invariance is kept as a consequence of various Ward identities obeyed by the computation. Adjusting the set of Migdal parameters to the data set we predict an attractive mass shift for the isobar of about 50 MeV at nuclear saturation density.

10 pages, 6 figures

References in corpus (13)

• Effective theory of the Delta(1232) in Compton scattering off the nucleon
• Hadronic Spectral Functions in Nuclear Matter
• Self consistent propagation of hyperons and antikaons in nuclear matter based on relativistic chiral SU(3) dynamics
• A Microscopic Calculation of Photoabsorption Cross Sections on Protons and Nuclei
• Photoproduction of pi0-mesons off protons from the Delta(1232) region to E(gamma) = 3 GeV
• Antikaons and hyperons in nuclear matter with saturation
• Self-consistent description of vector-mesons in matter
• Delta(1232) and Nucleon Spectral Functions in Hot Hadronic Matter
• Migdal's short range correlations in a covariant model
• Covariant propagator of the Rarita-Schwinger field in the nuclear medium
• Self consistent and covariant propagation of pions, nucleon and isobar resonances in cold nuclear matter
• Covariant and self consistent vertex corrections for pions and isobars in nuclear matter
• Self energies of the pion and the delta isobar from the ^3He(e,e'pi^+)^3H reaction

Cited by in corpus (12)

• Heavy Baryons in Compact Stars
• Delta isobars in relativistic mean-field models with $\sigma$-scaled hadron masses and couplings
• Delta baryons and diquark formation in the cores of neutron stars
• Charged $\rho$-meson condensation in neutron stars
• Variation of delta baryon mass and hybrid star properties in static and rotating conditions
• Covariant and self consistent vertex corrections for pions and isobars in nuclear matter
• Deconfinement of non-strange hadronic matter with nucleons and $\Delta$ baryons to quark matter in neutron stars
• Hyperonization in compact stars
• Role of $\Delta$s in determining the properties of Neutron Stars in parameterized hydrostatic equilibrium
• Nuclear Drell-Yan effect in a covariant model
• Effects of consistent and inconsistent isobar coupling in the nuclear medium
• Selfconsistent descriptions of vector-mesons in hot matter revisited