NA60 results on the ρ spectral function in In-In collisions

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 pi(+) pi(-) -> mu(+) mu(-) annihilation. The associated p spectral function exhibits considerable broadening, but essentially no shift in mass. The acceptance-corrected p(T) spectra have a shape atypical for radial flow. The also significantly depend on mass, pointing to different sources in different mass regions. Both mass p(T) spectra are compared to recent theoretical predictions.