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

G. Agakichiev C. Agodi H. Alvarez-Pol A. Balanda D. Bertini J. Bielcik G. Bellia M. Böhmer H. Bokemeyer J.L. Boyard 1 P. Braun-Munzinger P. Cabanelas S. Chernenko T. Christ R. Coniglione L. Cosentino J. Diaz F. Dohrmann I. Durán T. Eberl W. Enghardt L. Fabbietti O. Fateev C. Fernandez P. Finocchiaro J. Friese I. Fröhlich B. Fuentes C. Garabatos J. A. Garzón R. Gernhäuser C. Gilardi M. Golubeva D. González-Díaz E. Grosse F. Guber T. Hennino 1 S. Hlavac R. Holzmann J. Homolka A. Ierusalimov I. Iori A. Ivashkin M. Jaskula M. Jurkovic M. Kagarlis M. Kajetanowicz B. Kämpfer K. Kanaki T. Karavicheva A. Kastenmüller L. Kidoń P. Kienle I. Koenig W. Koenig H. J. Körner B. W. Kolb R. Kotte R. Krücken A. Kugler W. Kühn R. Kulessa A. Kurepin S. Lang S. Lange J. Lehnert E. Lins D. Magestro C. Maiolino A. Malarz J. Markert V. Metag J. Mousa M. Münch C. Müntz L. Naumann A. Nekhaev J. Novotny J. Otwinowski Y. C. Pachmayer V. Pechenov T. Pérez P. Piattelli J. Pietraszko R. Pleskac M. Ploskoń V. Pospísil W. Prokopowicz W. Przygoda B. Ramstein 1 A. Reshetin J. Ritman M. Roy-Stephan 1 A. Rustamov A. Sadovsky B. Sailer P. Salabura M. Sánchez P. Sapienza A. Schmah H. Schön W. Schön C. Schröder E. Schwab R. S. Simon V. Smolyankin L. Smykov S. Spataro B. Spruck H. Ströbele J. Stroth C. Sturm M. Sudol M. Suk A. Taranenko P. Tlusty A. Toia M. Traxler H. Tsertos D. Vassiliev A. Vázquez V. Wagner W. Walus M. Wisniowski T. Wójcik J. Wüstenfeld Y. Zanevsky K. Zeitelhack D. Zovinec P. Zumbruch
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.
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Submitted on : Monday, February 5, 2007 - 4:05:37 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:55 PM

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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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