# Dielectron Production in $^{12}$C+$^{12}$C Collisions at 2A GeV with the HADES Spectrometer

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 pi0-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi0 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00129072
Contributor : Suzanne Robert <>
Submitted on : Monday, February 5, 2007 - 4:05:37 PM
Last modification on : Wednesday, January 6, 2021 - 12:26:06 PM

### Citation

G. Agakichiev, C. Agodi, H. Alvarez-Pol, A. Balanda, D. Bertini, et al.. Dielectron Production in $^{12}$C+$^{12}$C Collisions at 2A GeV with the HADES Spectrometer. Physical Review Letters, American Physical Society, 2007, 98, pp.052302. ⟨10.1103/PhysRevLett.98.052302⟩. ⟨in2p3-00129072⟩

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