The HADES experiment, installed at GSI, Darmstadt, measures di-electron production in A + A, p/pi + N and p/pi + A collisions. Here, the pi(0) and eta Dalitz decays have been reconstruced in the exclusive p + p reaction at 2.2 GeV to form a reference cocktail for long-lived di-electron sources. In the C+C reaction at 1 and 2 GeV/u, these long-lived sources have been subtracted from the measured inclusive e(+)e(-) yield to exhibit the signal from the early phase of the collision. The results suggest that resonances play an important role in dense nuclear matter.
MESON AND DI-ELECTRON PRODUCTION WITH HADES
DESTEFANIS, MARCO GIOVANNI;SPATARO, STEFANO GIOVANNI;
2009-01-01
Abstract
The HADES experiment, installed at GSI, Darmstadt, measures di-electron production in A + A, p/pi + N and p/pi + A collisions. Here, the pi(0) and eta Dalitz decays have been reconstruced in the exclusive p + p reaction at 2.2 GeV to form a reference cocktail for long-lived di-electron sources. In the C+C reaction at 1 and 2 GeV/u, these long-lived sources have been subtracted from the measured inclusive e(+)e(-) yield to exhibit the signal from the early phase of the collision. The results suggest that resonances play an important role in dense nuclear matter.
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