Interaction of vector mesons with baryons and vectors in the nuclear medium

Abstract

In this talk we present a short review of recent developments concerning the interaction of vector mesons with baryons and with nuclei. We begin with the hidden gauge formalism for the interaction of vector mesons, then review results for vector baryon interaction and in particular the resonances which appear as composite states, dynamically generated from the interaction of vector mesons with baryons. New developments concerning the mixing of these states with pseudoscalars and baryons are also reported. We include some discussion on the $5/2^{+}$ $\Delta$ resonances around 2000 MeV, where we suggest that the $\Delta (2000)5/2^{+}$ resonance, which comes in the PDG from averaging a set of resonances appearing around 1700 MeV and another one around 2200 MeV, corresponds indeed to two distinct resonances. We also report on a hidden charm baryon state around 4400 MeV coming from the interaction of vector mesons and baryons with charm, and how this state has some repercussion in the $J/\psi$ suppression in nuclei. The interaction of $K^{\ast }$ in nuclei is also reported and suggestions are made to measure by means of the transparency ratio the huge width in the medium that the theoretical calculations predict. The formalism is extended to $J/\psi$ interaction with nuclei and the transparency ratio for $J/\psi$ photoproduction in nuclei is studied and shown to be a good tool to find possible baryon states which couple to $J/\psi N$.

arXiv comment20 pages, 12 figures, Talk given at the 50th International Winter Meeting on Nuclear Physics-Bormio2012, 23-27, January, Bormio, Italy

References in corpus (13)

• Chiral SU(3) theory of antikaon-nucleon interactions with improved threshold constraints
• Dynamically generated $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances in the hidden charm sector around 4.3 GeV
• Vector meson-vector meson interaction in a hidden gauge unitary approach
• K^- p scattering length from scattering experiments
• Dynamically generated resonances from the vector octet-baryon octet interaction
• Origin of resonances in the chiral unitary approach
• Chiral dynamics of kaon-nucleon interactions, revisited
• Surprises in threshold antikaon-nucleon physics
• Kaonic production of Lambda(1405) off deuteron target in chiral dynamics
• Effects of pseudoscalar-baryon channels in the dynamically generated vector-baryon resonances
• On the nature of the $\Lambda (1405)$ and $\Lambda (1670)$ from their $N_c$ behavior in chiral dynamics
• $J/\psi$ reaction mechanisms and suppression in the nuclear medium
• Vector- and Pseudoscalar-baryon coupled channel systems