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Damjanovic, S.
Nuclear physics. A, 02/2007, Volume: 783, Issue: 1Journal Article
The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 AGeV In-In collisions. A strong excess of pairs is observed above the yield expected from neutral meson decays. After subtraction of the decay sources, the shape of the resulting mass spectrum is largely consistent with a dominant contribution from π + π − → ρ → μ + μ − annihilation. The associated ρ spectral function exhibits considerable broadening, but essentially no shift in mass. The acceptance-corrected p T spectra have a shape atypical for radial flow. They also significantly depend on mass, pointing to different sources in different mass regions. Both mass and p T spectra are compared to recent theoretical predictions.
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