dorsal/arxiv
View SchemaDelta(1232) and Nucleon Spectral Functions in Hot Hadronic Matter
| Authors | Hendrik van Hees, Ralf Rapp |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0407050 |
| URL | https://arxiv.org/abs/nucl-th/0407050 |
| DOI | 10.1016/j.physletb.2004.10.062 |
| Journal | Phys.Lett. B606 (2005) 59-66 |
Abstract
Modifications of Delta(1232) and nucleon spectral functions at finite temperature and baryon density are evaluated in terms of resonant scattering off thermal pions, as well as a renormalization of the vacuum Delta-width including vertex corrections. The interactions are based on effective Lagrangians of pions and baryon resonances, with underlying parameters (coupling constants and form factors) determined by the elastic pi N scattering phase shift in the isobar channel, and by empirical decay branchings of excited resonances. Pion modifications are included via interactions in a pion gas, as well as standard Delta- and nucleon-hole excitations in nuclear matter. In hot hadronic matter, under conditions resembling thermal freezeout at the Relativistic Heavy-Ion Collider (RHIC), the Delta exhibits a significant broadening of ~65 MeV together with a slight upward peak shift of 5-10 MeV, in qualitative agreement with preliminary data from the STAR collaboration.
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"abstract": "Modifications of Delta(1232) and nucleon spectral functions at finite\ntemperature and baryon density are evaluated in terms of resonant scattering\noff thermal pions, as well as a renormalization of the vacuum Delta-width\nincluding vertex corrections. The interactions are based on effective\nLagrangians of pions and baryon resonances, with underlying parameters\n(coupling constants and form factors) determined by the elastic pi N scattering\nphase shift in the isobar channel, and by empirical decay branchings of excited\nresonances. Pion modifications are included via interactions in a pion gas, as\nwell as standard Delta- and nucleon-hole excitations in nuclear matter. In hot\nhadronic matter, under conditions resembling thermal freezeout at the\nRelativistic Heavy-Ion Collider (RHIC), the Delta exhibits a significant\nbroadening of ~65 MeV together with a slight upward peak shift of 5-10 MeV, in\nqualitative agreement with preliminary data from the STAR collaboration.",
"arxiv_id": "nucl-th/0407050",
"authors": [
"Hendrik van Hees",
"Ralf Rapp"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.physletb.2004.10.062",
"journal_ref": "Phys.Lett. B606 (2005) 59-66",
"title": "Delta(1232) and Nucleon Spectral Functions in Hot Hadronic Matter",
"url": "https://arxiv.org/abs/nucl-th/0407050"
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