期刊
PHYSICS LETTERS B
卷 690, 期 2, 页码 118-122出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2010.05.010
关键词
Virtual bremsstrahlung; Dileptons; Nucleon-nucleon collisions
资金
- BMBF, Germany [06TM970I, 06GI1461, 06FY91001, 06DR135]
- GSI [TM-FR1, GI/ME3, OF/SIR]
- Helmholtz Alliance [HA216/EMMI]
- Czech Republic [MSMT LC07050, LA316, GA ASCR IAA100480803]
- KBN, Poland [1P03B 056 29]
- INFN (Italy)
- XUGA PGID, Spain [TO2PXIC20605PN]
- Cyprus [UCY-10.3.11.12]
- INTAS [03-51-3208]
- EU [RII3-CT-2004-506078]
- [CNRS/IN2P3]
- [MCYT FPA2000-2041-C02-02]
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. (C) 2010 Elsevier B.V. All rights reserved.
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