Bonn 2010 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Hadronenstruktur und -spektroskopie IV
HK 17.3: Vortrag
Dienstag, 16. März 2010, 14:30–14:45, HG IV
ω-meson production in pp collisions at (s)1/=3.18 GeV — •Khaled Teilab, Ingo Fröhlich, Jochen Markert, Christian Müntz, Herbert Ströbele, Joachim Stroth, and Attilio Tarantola — Institut für Kernphysik, Goethe-Universität, Frankfurt am Main
ω-meson production in pp collisions was measured by HADES for the first time at (s)1/=3.18 GeV. During 20 days of beam time a total of 1.23×109 events were collected. In the analysis we have selected pp→ ppπ+π−π0 events by making use of particle identification for the protons and charged pions, a selection on the missing mass to identify the π0 and – in addition – a kinematic refit to improve the resolution and reduce the background.
The number of ω-mesons which have been reconstructed is about 76,000. This large number allows for the determination of both the production cross section and angular distribution. The determined exclusive cross section in the order of 102µb is in agreement with existing data and theoretical calculations based on one boson exchange models.
Using the same data set, the inclusive cross section for ω-production in the reaction pp→ω X→ e+e−X has been measured for the first time and is of the order of 2×102µb.
This work has been supported by BMBF (06FY171) and the Helmholtz research school for Quark-Matter studies (H-QM).