We report on a measurement of electron pair production in C-12+C-12 collisions at an incident energy of 2 GeV per nucleon with the HADES spectrometer. 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 account for all the yield up to 0.15 GeV/c(2), but for only about 50% above this mass. The excess yield is in agreement with the former DLS result if one assumes that it scales with beam energy like pion production. A preliminary analysis of C-12+C-12 collisions at an incident energy of 1 A GeV, measured with the HADES detector, supports this scenario.
Dielectron production in 12C+12C collisions at 2 AGeV with HADES
DESTEFANIS, MARCO GIOVANNI;SPATARO, STEFANO GIOVANNI;
2007-01-01
Abstract
We report on a measurement of electron pair production in C-12+C-12 collisions at an incident energy of 2 GeV per nucleon with the HADES spectrometer. 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 account for all the yield up to 0.15 GeV/c(2), but for only about 50% above this mass. The excess yield is in agreement with the former DLS result if one assumes that it scales with beam energy like pion production. A preliminary analysis of C-12+C-12 collisions at an incident energy of 1 A GeV, measured with the HADES detector, supports this scenario.
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