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arXiv · 1011.0615

Thermal Dileptons from Hot and Dense Strongly Interacting Matter

Hans J. Specht
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Abstract

The NA60 experiment at the CERN SPS has studied muon-pair production in 158A GeV In-In collisions. The unprecedented precision of the data has allowed to isolate a strong excess of pairs above the known sources in the whole invariant mass region 0.2 rho -> mu+mu- dominates. The associated space-time averaged rho spectral function shows a nearly diverging width in approaching chiral symmetry restoration, but essentially no shift in mass. Some in-medium effects are also seen for the omega, but not for the phi. For M>1 GeV, the average temperature associated with the mass spectrum is about 200 MeV, considerably above T_c=170 MeV, implying a transition to dominantly partonic emission sources in this region. The transition itself is mirrored by a large jump-like drop in the inverse slope of the transverse mass spectra around 1 GeV.

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Hans J. Specht. 2010-11-02. Thermal Dileptons from Hot and Dense Strongly Interacting Matter. https://doi.org/10.1063/1.3541982

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