0 10 80 17 v 1 8 A ug 2 00 1 1 Vector Mesons and Baryon Resonances in Nuclear Matter
نویسندگان
چکیده
We calculate the effect of many-body interactions in nuclear matter on the spectral function of ρ and ω meson. In particular, we focus on the role played by baryon resonances in this context.
منابع مشابه
0 30 90 85 v 2 2 7 M ay 2 00 4 Hadronic Spectral Functions in Nuclear Matter 1
We study the in-medium properties of mesons (π, η, ρ) and baryon resonances in cold nuclear matter within a coupled-channel analysis. The meson self energies are generated by particle-hole excitations. Thus multi-peak spectra are obtained for the mesonic spectral functions. In turn this leads to medium-modifications of the baryon resonances. Special care is taken to respect the analyticity of t...
متن کاملar X iv : h ep - p h / 01 05 03 3 v 1 3 M ay 2 00 1 Threshold η and η ′ electroproduction off nucleons 1
The electroproduction of η and η ′ mesons on the proton and the neutron is investigated at tree level within the framework of U (3) chiral perturbation theory. In addition to the Born terms low-lying resonances such as the vector mesons and J P = 1/2 + , 1/2 − baryon resonances are included explicitly and their contributions are calculated. Results for the separated differential cross sections ...
متن کاملth / 0 10 80 62 v 1 2 8 A ug 2 00 1 A meson exchange model for the YN interaction
We present a new model for the hyperon-nucleon (ΛN, ΣN) interaction, derived within the meson exchange framework. The model incorporates the standard one boson exchange contributions of the lowest pseudoscalar and vector meson multiplets with coupling constants fixed by SU(6) symmetry relations. In addition — as the main feature of the new model — the exchange of two correlated pions or kaons, ...
متن کاملar X iv : 0 80 8 . 06 72 v 1 [ he p - ph ] 5 A ug 2 00 8 1 Status of Lattice Studies of the QCD Phase Diagram
Determining the QCD phase diagram is a pressing task in view of its relevance for nuclear and astro-particle physics programmes. We review the current status of lattice calculations of the phase diagram in the (T, μB)-plane for baryon chemical potentials μB < ∼ 500 MeV. At μB = 0, simulations of staggered fermion actions predict the quark hadron transition to be a crossover in the continuum lim...
متن کاملl - th / 0 40 10 51 v 2 1 7 A pr 2 00 4 Photoproduction of K ∗ for the study of Λ ( 1405 )
The photo-induced K * vector meson production is investigated for the study of the Λ(1405) resonance. This reaction is particularly suited to the isolation of the second pole in the Λ(1405) region which couples dominantly to the ¯ KN channel. We obtain the mass distribution of the Λ(1405) which peaks at 1420 MeV, and differs from the nominal one. Combined with several other reactions, like the ...
متن کامل