Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Hadron Structure and Spectroscopy X

HK 63.5: Talk

Friday, March 18, 2016, 15:15–15:30, S1/01 A4

Inclusive Λ production in proton-proton at 3.5 GeV in HADES — •Rafal Lalik for the HADES collaboration — Excellence Cluster Universe, Technische Universität München, Boltzmannstr. 2, D-85748, Garching, Germany

The total production cross-section of Λ hyperions was measured with the HADES spectrometer at GSI Helmholtz in Darmstadt in the proton-proton reactions at √s=3.18 GeV. Experimental data were compared to data-driven model based on experimental results of Λ production in various exclusive channels measured in the same reaction at HADES. Beside phase-space production, contributions from Σ(1385), Δ and N^* intermediate resonances has been considered. It is shown in Partial Wave Analysis of pKΛ channel that pure phase-space production does not describe all kinematical variables of the observed distributions and inclusion of coherent sum of intermediate resonances is necessary. The differential cross-sections of each contributing channel is extracted via fit to the experimental data providing full description of the Λ production in this energy regime.

— This research was supported by the DFG cluster of excellence ’Origin and Structure of the Universe’.