Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 1: Hadron Structure and Spectroscopy I

HK 1.1: Gruppenbericht

Montag, 14. März 2016, 14:00–14:30, S1/01 A5

Proton polarizability program at CB-MAMI — •Cristina Collicott for the A2 collaboration — Institut für Kernphysik, Mainz, Deutschland — George Washington University, Washington DC, USA

Nucleon polarizabilities are fundamental structure observables, like the nucleon mass or charge, which are sensitive to the internal quark dynamics of the nucleon. Scalar and spin polarizabilities quantify the response of the proton's structure and spin respectively when an external electromagnetic field is applied. Polarized Compton scattering off the proton, where the photon acts as an electromagnetic probe, can be used to study the polarizabilities of the proton, thus probing its internal structure. While the scalar polarizabilities have been studied previously, albeit with large uncertainties, the spin polarizability terms have yet to be determined experimentally.

This talk will discuss an ongoing experimental program at MAMI to study both the scalar and spin terms of the proton polarizabilties. This program makes use of the Crystal Ball and TAPS detector system within the A2 collaboration at MAMI. Through a series of Compton scattering experiments, this program aims to reduce the large experimental uncertainties on the proton scalar polarizabilities, as well as determine the proton spin polarizabilities experimentally for the first time. A program overview and current results will be presented. This program is supported by the DFG under contract SFB1044, along with international support from the USA and Canada.