Darmstadt 2008 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Elektromagnetische und Hadronische Sonden
HK 9.3: Vortrag
Montag, 10. März 2008, 17:00–17:15, 1C
HADES results for the pp reaction at 2.2 GeV — •Ingo Fröhlich — Institut für Kernphysik, 60438 Frankfurt am Main
HADES has measured meson and di-lepton production in pp collisions at 2.2 GeV kinetic beam energy. For the inclusive reaction pp → X e+e−, the lepton pair spectra have been corrected for efficiency and trigger bias. Invariant mass spectra will be presented and compared to PLUTO and HSD [1] vacuum calculations, as well as to the C+C data at 2AGeV [2].
For the exclusive measurements, the reactions pp → pp π0, pp → pn π+ as well as pp → pp η have been identified by detecting 2 charged tracks in the final state. The first 2 reactions are dominated by Δ production and the latter one by an intermediate N*(1535) resonance. A precise knowledge of angular distributions of all resonances - production as well as the decay - is very important for the interpretation of the di-lepton spectra mentioned above. Preliminary results for these reactions will be presented.
This work has been supported by BMBF and GSI
[1] E.L.Bratkovskaya and W.Cassing, Phys. Reports 308 (1999) 65
[2] G. Agakichiev et al., Phys. Rev. Lett 98 (2007) 052302