International Workshop on Physics with Positrons at Jefferson Lab (JPos17)

Session

Plenary 12

Sep 15, 2017, 8:30 AM

Room F113 (CEBAF Center)

Conveners

Plenary 12

• John Arrington (Argonne National Laboratory)
• Eric Voutier (CNRS/IN2P3/IPNO - UPS)

20. JLEIC with Polarized Positrons

Fanglei Lin (Jefferson Lab)

9/15/17, 8:30 AM

Positron Source and Beam Physics

Oral Contribution

Both polarized and unpolarized positron beams with an energy range from a few eV to hundreds of GeV have diverse applications in medicine, material science and nuclear physics. In many cases, they are the unique tools for the study of the physical world. However, the creation of polarized positrons with sufficient intensity is particularly challenging. We propose a dedicated scheme to generate...

14. Positron beams and Two-photon-exchange: The key to precision form factors

Jan Bernauer (MIT)

9/15/17, 9:10 AM

Interference Physics

Oral Contribution

One of the puzzles of the proton form factor is the difference between determinations of the form factor ratio using unpolarized and polarized beams. The causal source of this discrepancy is is believed to be two photon exchange (TPE). Recent precision experiments at $Q^2$ below 2.5 $(\mathrm{GeV}/c)^2$ found smaller than expected but clear indication of two photon exchange. However, they...

12. Constraining Coulomb Corrections in DIS with Positrons

David Gaskell (Jefferson Lab)

9/15/17, 9:45 AM

Interference Physics

Oral Contribution

Measurements of Deep Inelastic Scattering (DIS) from nuclei, aimed at understanding the nuclear dependence of inelastic structure functions (the EMC effect), are typically performed at high energies, hence effects due to the acceleration of electrons in the Coulomb field of a large $Z$ nucleus are usually ignored. However, there are certain kinematics, in particular at large...