Speaker
Description
Electromagnetic polarizabilities are fundamental properties of composite systems, and measure the 'stiffness' of a system to electromagnetic deformation. Measurements of hadron polarizabilities provide a test of effective field theories, dispersion theories, and lattice calculations. While significant progress has been made in measuring proton polarizabilities, with uncertainties at the level of +/- 0.4 x 10-4 e fm2, experimental constraints on the charged and neutral pion polarizabilities (CPP and NPP) are much weaker, +/- 2 x 10-4 for the charged pion and no measurement for the neutral pion. The CPP/NPP experiment at the Jefferson Lab GlueX detector utilizes a new technique to measure pion polarizability, Primakoff photo-production of charged and neutral pion pairs using linearly polarized 6 GeV photons on a nuclear target, 208Pb. The CPP/NPP experiment finishing data taking at JLab in summer 2022. In this talk the experimental setup and preliminary physics distributions will be presented.
