Dielectron Production in C12+C12 Collisions at 2AGeV with the HADES Spectrometer

G. Agakichiev et al. (HADES Collaboration)
Phys. Rev. Lett. 98, 052302 – Published 1 February 2007

Abstract

The invariant-mass spectrum of e+e pairs produced in C12+C12 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 π0-Dalitz to the ρ/ω invariant-mass region. Dalitz decays of π0 and η account for all the yield up to 0.15GeV/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.

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  • Received 10 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.052302

©2007 American Physical Society

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Vol. 98, Iss. 5 — 2 February 2007

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