Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2006-08-16
Phys.Rev.Lett.98:052302,2007
Physics
Nuclear Physics
Nuclear Experiment
Scientific paper
10.1103/PhysRevLett.98.052302
The invariant-mass spectrum of $e^+ e^-$ pairs produced in $^{12}$C+$^{12}$C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over five orders of magnitude from the $\pi^0$-Dalitz to the $\rho/\omega$ invariant-mass region. Dalitz decays of $\pi^0$ and $\eta$ account for all the yield up to 0.15 GeV/c$^2$, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.
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