2009
DOI: 10.1016/j.ppnp.2008.12.031
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Thermal dileptons in high-energy nuclear collisions

Abstract: Clear signs of excess dileptons above the known sources were found at the SPS since long. However, a real clarification of these observations was only recently achieved by NA60, measuring dimuons with unprecedented precision in 158A GeV In-In collisions. The excess mass spectrum in the region M <1 GeV is consistent with a dominant contribution fromThe associated ρ spectral function shows a strong broadening, but essentially no shift in mass. In the region M >1 GeV, the excess is found to be prompt, not due to … Show more

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