First measurement of the rho spectral function in nuclear collisions

Details First measurement of the rho spectral function in nuclear collisions First measurement of the rho spectral function in nuclear collisions

2005-10-13

arxiv.org/abs/nucl-ex/0510044v1

Nucl.Phys. A774 (2006) 715-718

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, Proceedings of Quark Matter 2005, Budapest

Scientific paper

The NA60 experiment has studied low-mass muon pairs in 158 AGeV Indium-Indium collisions at the CERN SPS. A strong excess of pairs is observed above the expectation from neutral meson decays. The unprecedented sample size of 360 000 events and the good mass resolution of about 2% allow to isolate the excess by subtraction of the known sources. The shape of the resulting mass spectrum is consistent with a dominant contribution from pi+ pi- -> rho -> mu+ mu- annihilation. The associated rho spectral function shows a strong broadening, but essentially no shift in mass.

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