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Author  |
HADES Collaboration (Agakishiev, G. et al); Diaz, J.; Gil, A. | ||||
| Title | Origin of the low-mass electron pair excess in light nucleus-nucleus collisions | Type | Journal Article | ||
| Year | 2010 | Publication | Physics Letters B | Abbreviated Journal | Phys. Lett. B |
| Volume | 690 | Issue | 2 | Pages | 118-122 |
| Keywords | 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. | ||||
| Address | [Froehlich, I.; Galatyuk, T.; Goebel, K.; Lorenz, M.; Markert, J.; Michel, J.; Muentz, C.; Pachmayer, Y. C.; Stroebele, H.; Stroth, J.; Sturm, C.; Tarantola, A.; Teilab, K.] Goethe Univ Frankfurt, Inst Kernphys, D-60438 Frankfurt, Germany, Email: t.galatyuk@gsi.de | ||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier Science Bv | Place of Publication | Editor | ||
| Language | English | Summary Language | Original Title | ||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0370-2693 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000279513800003 | Approved | no | ||
| Is ISI | yes | International Collaboration | yes | ||
| Call Number | IFIC @ elepoucu @ | Serial | 413 | ||
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