Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2006-11-13
Phys.Lett.B666:425-429,2008
Physics
Nuclear Physics
Nuclear Experiment
Revised version
Scientific paper
10.1016/j.physletb.2008.07.104
We present a measurement of $e^+e^-$ pair production in central Pb-Au collisions at 158$A$ GeV/$c$. As reported earlier, a significant excess of the $e^+e^-$ pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the $\rho$ spectral function over a density-dependent shift of the $\rho$ pole mass. The in-medium broadening model implies that baryon induced interactions are the key mechanism to in-medium modifications of the $\rho$-meson in the hot fireball at SPS energy.
Adamová D.
CERES Collaboration
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