Low mass dimuons produced in relativistic nuclear collisions

Jörg Ruppert, Charles Gale, Thorsten Renk, Peter Lichard, Joseph I. Kapusta

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


The NA60 experiment has measured low mass muon pair production in In-In collisions at 158AGeV with unprecedented precision. We show that these data are reproduced very well by a dynamical model with parameters scaled from fits to measurements of hadronic transverse mass spectra and Hanbury Brown-Twiss correlations in Pb-Pb and Pb-Au collisions at the same energy. The data are consistent with in-medium properties of ρ and ω mesons at finite temperature and density as deduced from empirical forward-scattering amplitudes. Inclusion of the vacuum decay of the ρ meson after freeze-out is necessary for an understanding of the mass and transverse momentum spectrum of dimuons with M 0.9GeV/c2.

Original languageEnglish (US)
Article number162301
JournalPhysical review letters
Issue number16
StatePublished - Apr 21 2008


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