Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Poster – Hadronenstruktur und -spektroskopie

HK 45.7: Poster

Donnerstag, 22. März 2012, 14:00–16:00, P Foyer

Future experiments with Pion Beams^* — Johannes Siebenson and •Rafal Lalik — TU München, Boltzmannstr. 2, 85748 Garching, Germany

New experiments exploiting secondary pion beams with incoming momenta varying from 0.8 to 1.7 GeV/c are planned for the HADES spectrometer at GSI, SIS18. This will provide a unique possibility to study a variety of physics observable exploiting both hadronic and leptonic probes.

For this a new beam detector, based on large area silicons, for the measurement of the incoming pion momentum is under construction. The detector readout system is based on the n-XYTER ASIC (DETNI, GSI Darmstadt) and Exploder (GSI Darmstatd) boards. The status of the project will be described in this contribution.

Additionally full scale simulations with a pion beam momentum of 1.75 GeV have been analyzed with focus on the production of the Λ(1405) hyperon. At the moment this resonance is of large interest, as its formation is highly influenced by the KN dynamics. The rather low cross section of the reaction π+p→Λ(1405)+K⁰ and the decay into Σπ pairs make the reconstruction of this particle a challenging task. We present our results on the Λ(1405) analysis and estimations of the expected yields for the upcoming beam time.

^*) supported by BMBF and Excellence Cluster "Universe"