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

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

2009-10-30

arxiv.org/abs/0910.5875v1

Physics

Nuclear Physics

Nuclear Experiment

11 pages, 2 figures, \usepackage{epsfig}

Scientific paper

We report measurements of electron pair production in elementary p+p and d+p reactions at 1.25 GeV/u 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/c2 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.

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