Comprehensive Interpretation of Thermal Dileptons at the SPS

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dc.creatorvan Hees, Hendrik
dc.creatorRapp, Ralf
dc.date2006-03-10
dc.date2006-08-28
dc.date.accessioned2026-07-07T07:06:07Z
dc.date.available2026-07-07T07:06:07Z
dc.descriptionEmploying thermal dilepton rates based on medium-modified electromagnetic correlation functions we show that recent dimuon spectra of the NA60 collaboration in central In-In collisions at the CERN-SPS can be understood in terms of radiation from a hot and dense hadronic medium. Earlier calculated ρ-meson spectral functions, as following from hadronic many-body theory, provide an accurate description of the data up to dimuon invariant masses of about M\simeq 0.9 GeV, with good sensitivity to details of the predicted ρ-meson line shape. This, in particular, identifies baryon-induced effects as the prevalent ones. We show that a reliable description of the ρcontribution opens the possibility to study further medium effects: at higher masses (M \simeq 0.9-1.5 GeV) 4-pion type annihilation is required to account for the experimentally observed excess indicating precursor effects of chiral symmetry restoration (``chiral mixing''), while remaining structures in the ωand ϕregion are suggestive for modifications in their line shapes as well.
dc.description4 pages, 4 figures, v2: slightly improved estimate of four-pion contributions; accepted for publication in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/hep-ph/0603084
dc.identifierhttp://arxiv.org/abs/hep-ph/0603084
dc.identifierPhys.Rev.Lett. 97 (2006) 102301
dc.identifierdoi:10.1103/PhysRevLett.97.102301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/109907
dc.subjectHigh Energy Physics - Phenomenology
dc.titleComprehensive Interpretation of Thermal Dileptons at the SPS
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