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          Institute: MPI für Physik     Collection: YB 2016     Display Documents



ID: 716311.0, MPI für Physik / YB 2016
Energy Dependence of Acceptance-corrected Dielectron Excess Mass Spectrum at Mid-rapidity in Au+Au Collisions at sqrt{s_NN} = 19.6 and 200 GeV
Authors:STAR Collaboration; Adamczyk, L.; Schmitz, N.; Seyboth, P.; et al.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physics Letters B
Journal Abbrev.:Phys.Lett.B
Issue / Number:750
Start Page:64
End Page:71
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:The acceptance-corrected dielectron excess mass spectra, where the known hadronic sources have been subtracted from the inclusive dielectron mass spectra, are reported for the first time at mid-rapidity |y_{ee}|<1 in minimum-bias Au+Au collisions at sqrt{s_NN} = 19.6 and 200 GeV. The excess mass spectra are consistently described by a model calculation with a broadened \\rho spectral function for M_ee<1.1 GeV/c^2. The integrated dielectron excess yield at sqrt{s_NN} = 19.6 GeV for 0.4<M_ee<0.75 GeV/c^2, normalized to the charged particle multiplicity at mid-rapidity, has a value similar to that in In+In collisions at sqrt{s_NN} = 17.3 GeV. For sqrt{s_NN} = 200 GeV, the normalized excess yield in central collisions is higher than that at sqrt{s_NN} = 17.3 GeV and increases from peripheral to central collisions. These measurements indicate that the lifetime of the hot, dense medium created in central Au+Au collisions at sqrt{s_NN} = 200 GeV is longer than those in peripheral collisions and at lower energies.
Classification / Thesaurus:STAR
Comment of the Author/Creator:9 pages, 6 figures
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2015-351
URL:http://inspirehep.net/search?p=find+eprint+1501.05...
URL:http://arXiv.org/abs/arxiv:1501.05341
URL:https://publications.mppmu.mpg.de/?action=search&m...
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