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Dielectron production in $^{12}$C+$^{12}$C collisions at 2 A GeV with HADES

Abstract : We report on a measurement of electron pair production in 12C+12C collisions at an incident energy of 2 GeV per nucleon with the HADES spectrometer. The measured pair production probabilities span over five orders of magnitude from the π0-Dalitz to the ρ/ω invariant-mass region. Dalitz decays of π0 and η account for all the yield up to 0.15 GeV/c2, but for only about 50% above this mass. The excess yield is in agreement with the former DLS result if one assumes that it scales with beam energy like pion production. A preliminary analysis of 12C+12C collisions at an incident energy of 1 A GeV, measured with the HADES detector, supports this scenario.
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http://hal.in2p3.fr/in2p3-00287017
Contributor : Suzanne Robert <>
Submitted on : Tuesday, June 10, 2008 - 3:27:45 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:14 PM

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J. Markert, G. Agakishiev, C. Agodi, A. Balanda, G. Bellia, et al.. Dielectron production in $^{12}$C+$^{12}$C collisions at 2 A GeV with HADES. QUARK MATTER 2006 - THE 19TH INTERNATIONAL CONFERENCE ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, Nov 2006, Shanghai, China. pp.S1041-S1045, ⟨10.1088/0954-3899/34/8/S152⟩. ⟨in2p3-00287017⟩

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