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Origin of the low-mass electron pair excess in light nucleus-nucleus collisions

AuthorsHADES Collaboration; Díaz Medina, José ; Gil Ortiz, Alejandro; Agakishiev, G.; Ramstein, B.
Issue Date14-Jun-2010
CitationPhysics Letters - Section B 690 (2): 118-122 (2010)
AbstractWe report measurements of electron pair production in elementary p + p and d + p reactions at 1.25 GeV/mu with the HADES spectrometer. For the first time, the electron pairs were reconstructed for n + p reactions by detecting the proton spectator from the deuteron breakup. We find that the yield of electron pairs with invariant mass Me+e- > 0.15 GeV/c(2) is about an order of magnitude larger in n + p reactions as compared to p + p. A comparison to model calculations demonstrates that the production mechanism is not sufficiently described yet. The electron pair spectra measured in C + C reactions are compatible with a superposition of elementary n + p and p + p collisions, leaving little room for additional electron pair sources in such light collision systems.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2010.05.010
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