1 GeV/u C+C碰撞中的双电子产生和DLS难题的解决
Dielectron Production in C+C Collisions at 1 GeV/u and the Solution to the DLS Puzzle
摘要：
利用德国达姆施塔特GSI的HADES实验研究了1GeV/u的C+C碰撞中e+e对的产生。在不变质量区域$ 0.15\: GeV/c^{2} \leq M_{ee} \leq 0.5\: GeV/c^{2}$，测得的电子对产额显示出比冻结后强子衰变预期的贡献强的过量。在相同的体系和能量条件下，所得数据与以前的DLS实验结果符合得很好。
英文摘要：
The production of e+e- pairs in C+C collisions at 1 GeV/u was investigated with the HADES experiment at GSI, Darmstadt. In the invariant-mass region $ 0.15\: GeV/c^{2} \leq M_{ee} \leq 0.5\: GeV/c^{2}$ the measured pair yield shows a strong excess above the contribution expected from hadron decays after freeze-out. The data are in good agreement with the results of the former DLS experiment for the same system and energy.
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