Abstract
The properties of {rho}- and {eta}-mesons in nuclear matter are studied within the scope of hadronic models. Unknown model parameters are obtained from fits to scattering data. - The treatment of the {rho}-meson includes the coupling to two pions which, in matter, are strongly mixed with delta-particle-nucleon-hole states. The {rho}-meson self-energy is evaluated in a current conserving approximation with in-medium pion propagators and vertex corrections. While the position of the original peak in the spectral function remains almost unchanged, its width grows rapidly with increasing density. Consequently, the {rho}-meson strength function is strongly dispersed at high densities. Due to vertex corrections a new peak at a mass around 3m{sub {pi}} emerges with increasing density, while the spectral function around the two-pion threshold is found to be smooth at all densities. The {eta}-meson is strongly mixed with N{sup *}(1535)-particle-nucleon-hole states in nuclear matter. The corresponding dispersion relations with an upper and a lower branch look similar to those of the ({pi}, {Delta}N{sup -1})-modes. However, since the N{sup *} is an S-wave resonance in the {eta}N-channel, the repulsion of the two branches survives at zero momentum. (orig.)
Herrmann, M;
[1]
Sauermann, C;
[1]
Friman, B L;
[1]
Noerenberg, W
[1]
- Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)
Citation Formats
Herrmann, M, Sauermann, C, Friman, B L, and Noerenberg, W.
Properties of rho and eta mesons in nuclear matter.
Germany: N. p.,
1993.
Web.
Herrmann, M, Sauermann, C, Friman, B L, & Noerenberg, W.
Properties of rho and eta mesons in nuclear matter.
Germany.
Herrmann, M, Sauermann, C, Friman, B L, and Noerenberg, W.
1993.
"Properties of rho and eta mesons in nuclear matter."
Germany.
@misc{etde_10139903,
title = {Properties of rho and eta mesons in nuclear matter}
author = {Herrmann, M, Sauermann, C, Friman, B L, and Noerenberg, W}
abstractNote = {The properties of {rho}- and {eta}-mesons in nuclear matter are studied within the scope of hadronic models. Unknown model parameters are obtained from fits to scattering data. - The treatment of the {rho}-meson includes the coupling to two pions which, in matter, are strongly mixed with delta-particle-nucleon-hole states. The {rho}-meson self-energy is evaluated in a current conserving approximation with in-medium pion propagators and vertex corrections. While the position of the original peak in the spectral function remains almost unchanged, its width grows rapidly with increasing density. Consequently, the {rho}-meson strength function is strongly dispersed at high densities. Due to vertex corrections a new peak at a mass around 3m{sub {pi}} emerges with increasing density, while the spectral function around the two-pion threshold is found to be smooth at all densities. The {eta}-meson is strongly mixed with N{sup *}(1535)-particle-nucleon-hole states in nuclear matter. The corresponding dispersion relations with an upper and a lower branch look similar to those of the ({pi}, {Delta}N{sup -1})-modes. However, since the N{sup *} is an S-wave resonance in the {eta}N-channel, the repulsion of the two branches survives at zero momentum. (orig.)}
place = {Germany}
year = {1993}
month = {Oct}
}
title = {Properties of rho and eta mesons in nuclear matter}
author = {Herrmann, M, Sauermann, C, Friman, B L, and Noerenberg, W}
abstractNote = {The properties of {rho}- and {eta}-mesons in nuclear matter are studied within the scope of hadronic models. Unknown model parameters are obtained from fits to scattering data. - The treatment of the {rho}-meson includes the coupling to two pions which, in matter, are strongly mixed with delta-particle-nucleon-hole states. The {rho}-meson self-energy is evaluated in a current conserving approximation with in-medium pion propagators and vertex corrections. While the position of the original peak in the spectral function remains almost unchanged, its width grows rapidly with increasing density. Consequently, the {rho}-meson strength function is strongly dispersed at high densities. Due to vertex corrections a new peak at a mass around 3m{sub {pi}} emerges with increasing density, while the spectral function around the two-pion threshold is found to be smooth at all densities. The {eta}-meson is strongly mixed with N{sup *}(1535)-particle-nucleon-hole states in nuclear matter. The corresponding dispersion relations with an upper and a lower branch look similar to those of the ({pi}, {Delta}N{sup -1})-modes. However, since the N{sup *} is an S-wave resonance in the {eta}N-channel, the repulsion of the two branches survives at zero momentum. (orig.)}
place = {Germany}
year = {1993}
month = {Oct}
}