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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Hadron Structure and Spectroscopy 4

HK 19.4: Talk

Monday, March 23, 2015, 18:15–18:30, T/SR25

Modifications of the D₃₃(1700) resonance in the nuclear medium — •Vahe Sokhoyan for the A2 collaboration — Institut für Kernphysik, Universität Mainz

Despite the progress in particle and nuclear physics, the origin of the mass being a fundamental property of matter is not fully understood. The modification of the mass and lifetime of hadrons in the nuclear medium is an important aspect which concerns the origin of the mass directly. At the MAMI accelerator facility in Mainz the modifications of the D₃₃(1700) resonance will be studied in the reaction γ p → p π⁰ η close to the production threshold where the dominance of this resonance is established. The new approach to study in-medium modifications of baryon resonances by the determination of polarization observables in addition to unpolarized cross-sections will be discussed in this talk. The measurements will be performed with circularly polarized photons and a set of different targets (¹²C, ⁴⁰Ca, ⁹³Nb and ²⁰⁸Pb) using the Crystal Ball/TAPS 4π spectrometer setup.
This work is supported by the Carl-Zeiss-Stiftung.