dorsal/arxiv
View SchemaWhat does the rho-meson do? In-medium mass shift scenarios versus hadronic model calculations
| Authors | Jorg Ruppert, Thorsten Renk |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0609083 |
| URL | https://arxiv.org/abs/nucl-th/0609083 |
| DOI | 10.1140/epjc/s10052-006-0072-y |
| Journal | Eur.Phys.J.C49:219-224,2007 |
Abstract
The NA60 experiment has studied low-mass muon pair production in In-In collisions at $158 {\rm AGeV}$ with unprecedented precision. With these results there is hope that the in-medium modifications of the vector meson spectral function can be constrained more thoroughly than before. We investigate in particular what can be learned about collisional broadening by a hot and dense medium and what constrains the experimental results put on in-medium mass shift scenarios. The data show a clear indication of considerable in-medium broadening effects but disfavor mass shift scenarios where the $\rho$-meson mass scales with the square root of the chiral condensate. Scaling scenarios which predict at finite density a dropping of the $\rho$-meson mass that is stronger than that of the quark condensate are clearly ruled out since they are also accompanied by a sharpening of the spectral function.
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"abstract": "The NA60 experiment has studied low-mass muon pair production in In-In\ncollisions at $158 {\\rm AGeV}$ with unprecedented precision. With these results\nthere is hope that the in-medium modifications of the vector meson spectral\nfunction can be constrained more thoroughly than before. We investigate in\nparticular what can be learned about collisional broadening by a hot and dense\nmedium and what constrains the experimental results put on in-medium mass shift\nscenarios. The data show a clear indication of considerable in-medium\nbroadening effects but disfavor mass shift scenarios where the $\\rho$-meson\nmass scales with the square root of the chiral condensate. Scaling scenarios\nwhich predict at finite density a dropping of the $\\rho$-meson mass that is\nstronger than that of the quark condensate are clearly ruled out since they are\nalso accompanied by a sharpening of the spectral function.",
"arxiv_id": "nucl-th/0609083",
"authors": [
"Jorg Ruppert",
"Thorsten Renk"
],
"categories": [
"nucl-th"
],
"doi": "10.1140/epjc/s10052-006-0072-y",
"journal_ref": "Eur.Phys.J.C49:219-224,2007",
"title": "What does the rho-meson do? In-medium mass shift scenarios versus hadronic model calculations",
"url": "https://arxiv.org/abs/nucl-th/0609083"
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