@Article{HADESCollaborationAgakishiev_etal2010,
author="HADES Collaboration (Agakishiev, G. et al
and Diaz, J.
and Gil, A.",
title="Origin of the low-mass electron pair excess in light nucleus-nucleus collisions",
journal="Physics Letters B",
year="2010",
publisher="Elsevier Science Bv",
volume="690",
number="2",
pages="118--122",
optkeywords="Virtual bremsstrahlung; Dileptons; Nucleon-nucleon collisions",
abstract="We 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.",
optnote="ISI:000279513800003",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=413), last updated on Fri, 20 May 2016 14:29:30 +0000",
issn="0370-2693",
doi="10.1016/j.physletb.2010.05.010",
opturl="http://arxiv.org/abs/0910.5875",
opturl="https://doi.org/10.1016/j.physletb.2010.05.010",
archivePrefix="arXiv",
eprint="0910.5875",
language="English"
}