Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Hadron Structure and Spectroscopy VI

HK 37.2: Talk

Wednesday, February 28, 2018, 17:00–17:15, HZO 50

Helicity dependence of single neutral pion photoproduction on deuteron — •Federico Cividini for the A2 collaboration — Institut für Kernphysik - Universität Mainz

During the pion production reaction, the nucleon is excited to an intermediate resonant state, and a complete analysis of the experimental data gives a determination of the main properties of the baryon resonances. A detailed knowledge of the spectrum of nucleon excited states gives essential constraints on models for nucleon structure. The data for the observables accessible using a polarised photon beam and/or polarised nucleon targets are scarce in many channels, especially in those induced on the neutron. A systematic measurement of all different observables is under way at the the Mainz facility by the A2@MAMI collaboration.

This talk will focus on the measurement performed at the Mainz Microtron using a circularly polarised photon beam and longitudinally polarised proton and deuteron target in combination with the large acceptance Crystal Ball/TAPS detection setup. An overview of the status of the experiment will be given together with the preliminary results of the helicity asymmetry of the single pi0 photoproduction reaction from the deuteron target.

Supported by DFG under contract SFB1044