Conveners
PWG - 4
- Axel Schmidt (George Washington University)
Axial structure of the nucleon with positron capture at medium energies
A medium energy polarized positron beam would enable the extraction of the axial form factor $G_A(Q^2)$ of the nucleon and its four-momentum transfer square ($Q^2$) dependence, using the weak capture reaction in deuterium ($ \vec{e^+} + {^2H} \rightarrow 2p + \bar{\nu}_{e}$). A polarized positron beam with beam energies...
Semi-inclusive meson production is used to access transverse momentum dependent distributions (TMD) or partons in a nucleon. We investigate a role of two-photon exchange (TPE) for this process. Such calculations require a model of nucleon structure. At the first step, we perform separation of hard and soft photon exchange. Soft photon exchange is demonstrated to be model-independent due to a...
Inspired by the proton radius puzzle, the MUon Scattering Experiment (MUSE) at Paul Scherrer Institute (PSI) in Villigen, Switzerland, was introduced to provide new information by simultaneously measuring elastic scattering of electrons and muons, as well as positrons and antimuons from a liquid hydrogen target. MUSE aims to provide precise cross sections with extractions of the electric form...
