Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-05-22
J.Phys.G34:S1023-1028,2007
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 4 figures, Quark Matter 2006 conference proceedings
Scientific paper
10.1088/0954-3899/34/8/S148
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. The unprecedented sample size of close to 400K events and the good mass resolution of about 2% have made it possible to isolate the excess by subtraction of the decay sources (keeping the $\rho$). The shape of the resulting mass spectrum exhibits considerable broadening, but essentially no shift in mass. The acceptance-corrected transverse-momentum spectra have a shape atypical for radial flow and show a significant mass dependence, pointing to different sources in different mass regions.
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