Low Mass Dimuons Produced in Relativistic Nuclear Collisions
Journal Article
·
· Physical Review Letters
- Department of Physics, McGill University, 3600 University Street, Montreal, QC, H3A 2T8 Canada (Canada)
- Department of Physics, PO Box 35 FIN-40014, University of Jyvaeskylae, Finland and Helsinki Institute of Physics, PO Box 64 FIN-00014, University of Helsinki (Finland)
- Institute of Physics, Silesian University in Opava, Bezrucovo nam. 13, 746 01 Opava, Czech Republic and Institute of Experimental and Applied Physics, Czech Technical University, Horska 3, 12800 Prague (Czech Republic)
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
The NA60 experiment has measured low mass muon pair production in In-In collisions at 158A GeV 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 {rho} and {omega} mesons at finite temperature and density as deduced from empirical forward-scattering amplitudes. Inclusion of the vacuum decay of the {rho} meson after freeze-out is necessary for an understanding of the mass and transverse momentum spectrum of dimuons with M < or approx. 0.9 GeV/c{sup 2}.
- OSTI ID:
- 21128073
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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