The invariant-mass spectrum of e+e- pairs produced in 12C + 12C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the pi°-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi° and eta account for all the yield up to 0:15 GeV=c2, 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.
Dielectron Production in 12C + 12C Collisions at 2A GeV with the HADES Spectrometer
SPATARO, STEFANO GIOVANNI;
2007-01-01
Abstract
The invariant-mass spectrum of e+e- pairs produced in 12C + 12C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the pi°-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi° and eta account for all the yield up to 0:15 GeV=c2, 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.