Month: June 2021

New paper published on future positron-proton polarization transfer experiment

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The European Physical Journal A has now published a paper led by Professor Puckett together with Professors Axel Schmidt of George Washington University and Jan Bernauer of Stony Brook University describing a future experiment to measure polarization transfer in positron-proton elastic scattering at large momentum transfers. These measurements would provide new information to constrain the effects of multi-photon-exchange in elastic lepton-proton scattering, thought to explain the discrepancy between cross section and polarization measurements in extractions of the proton electromagnetic form factor ratio at large momentum transfers.

https://inspirehep.net/literature/1860752

https://doi.org/10.1140/epja/s10050-021-00509-5

FF ratio vs Q2
Future positron-proton polarization data (green “x”-es) compared to existing cross section and polarization data as a function of the momentum transfer Q^2
Form factor ratio vs. epsilon
Proton form factor ratio at Q^2 = 2.5 GeV^2 versus the virtual photon polarization epsilon, comparing projected future positron-proton measurements (blue triangles and red square) to existing electron-proton scattering data.