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The invariant-mass spectrum of $e^+ e^-$ pairs produced in $^{12}$C+$^{12}$Ccollisions at an incident energy of 2 GeV per nucleon has been measured for thefirst time. The measured pair production probabilities span over five orders ofmagnitude 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 0.15GeV/c$^2$, but for only about 50% above this mass. A comparison with modelcalculations shows that the excess pair yield is likely due to baryon-resonanceand vector-meson decays. Transport calculations based on vacuum spectralfunctions fail, however, to describe the entire mass region

physical review letters

Dielectron Production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts /><mml:none /><mml:mn>12</mml:mn></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts /><mml:none /><mml:mn>12</mml:mn></mml:mmultiscripts></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi>A</…

Dielectron Production inC12+C12Collisions at2A