# NA60 results on $p_T$ spectra and the $\rho$ spectral function in In-In collisions

Abstract : 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.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00148802
Contributor : Dominique Girod <>
Submitted on : Wednesday, May 23, 2007 - 11:47:29 AM
Last modification on : Thursday, March 19, 2020 - 9:55:37 AM

### Citation

J. Seixas, R. Arnaldi, R. Averbeck, K. Banicz, J. Castor, et al.. NA60 results on $p_T$ spectra and the $\rho$ spectral function in In-In collisions. 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions: Quark Matter 2006 (QM2006), Nov 2006, Shanghai, China. pp.S1023-S1027, ⟨10.1088/0954-3899/34/8/S148⟩. ⟨in2p3-00148802⟩

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