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Agakichiev, B. [Author]; Agodi, C. [Author]; Braun-Munzinger, P. [Author]; Schon, W. [Author]; Schroder, C. [Author]; Schwab, E. [Author]; Simon, R. S. [Author]; Smolyankin, V. [Author]; Smykov, L. [Author]; Spataro, S. [Author]; Spruck, B. [Author]; Strobele, H. [Author]; Stroth, J. [Author]; Cabanelas, P. [Author]; Sturm, C. [Author]; Sudol, M. [Author]; Suk, M. [Author]; Taranenko, A. [Author]; Tlusty, P. [Author]; Toia, A. [Author]; Traxler, M. [Author]; Tsertos, H. [Author]; Vassiliev, D. [Author]; Vazquez, A. [Author]; [...]

Dielectron production in C-12+C-12 collisions at 2-AGeV with HADES

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  • Media type: E-Article
  • Title: Dielectron production in C-12+C-12 collisions at 2-AGeV with HADES
  • Contributor: Agakichiev, B. [Author]; Agodi, C. [Author]; Braun-Munzinger, P. [Author]; Schon, W. [Author]; Schroder, C. [Author]; Schwab, E. [Author]; Simon, R. S. [Author]; Smolyankin, V. [Author]; Smykov, L. [Author]; Spataro, S. [Author]; Spruck, B. [Author]; Strobele, H. [Author]; Stroth, J. [Author]; Cabanelas, P. [Author]; Sturm, C. [Author]; Sudol, M. [Author]; Suk, M. [Author]; Taranenko, A. [Author]; Tlusty, P. [Author]; Toia, A. [Author]; Traxler, M. [Author]; Tsertos, H. [Author]; Vassiliev, D. [Author]; Vazquez, A. [Author]; [...]
  • imprint: APS, 2007
  • Published in: Physical review letters 98, 052302 (2007). doi:10.1103/PhysRevLett.98.052302
  • Language: English
  • DOI: https://doi.org/10.1103/PhysRevLett.98.052302
  • ISSN: 0031-9007
  • Keywords: carbon ; spectral representation ; pseudoscalar meson: decay ; magnetic spectrometer: experimental results ; vector meson: decay ; 1-2 GeV/nucleon ; quantum molecular dynamics: relativistic ; mass spectrum: (positron electron) ; Darmstadt SIS ; model: production ; scattering: heavy ion ; electron: pair production
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  • Description: The invariant-mass spectrum of e(+) e(-) pairs produced in C-12 + C-12 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(0)-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi(0) and eta account for all the yield up to 0.15 GeV/c(2), 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.
  • Access State: Open Access