2006/05/11 by Thorsten Renk, Jörg Ruppert, Renk, Thorsten +2
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Advanced biosensing and bioanalysis techniques #Cancer Research and Treatments #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #RNA Interference and Gene Delivery #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0605130
arxiv created 2006/05/11 · openalex publication_date 2006/05/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The NA60 experiment has studied low-mass muon pair production in In-In collisions at 158 AGeV with unprecedented precision. Thus, there is hope that the in-medium modifications of the vector meson spectral function can be constrained more thoroughly than from previous experiments. Towards this goal, we present a study comparing different models for the in-medium modification of vector mesons. In particular, we investigate what can be learned about collisional broadening by a medium at finite temperature and baryon density and what model independent constraints can be obtained from the data. Of special relevance is a comparison to pT-cuts of the dilepton spectra. Those not only provide independent tests of the evolution model and pT-dependence of the spectral function but also unambiguously decide if the observed yield in the higher mass spectrum M > 1 \rm GeV is mainly due to the hot phase of the evolution or four pion annihilation processes.