Conveners
Electron Scattering 1
- Guy Ron (Hebrew University of Jerusalem)
Dasuni Adikaram
(Jefferson Lab)
4/8/15, 4:00 PM
invited talk
There is a significant discrepancy between the values of the proton electric form factor, $G^p_E$, extracted using unpolarized and polarized electron scattering. Calculations predict that small two photon exchange (TPE) contributions can significantly affect the extraction of $G^p_E$ from the un-polarized electron-proton cross sections. We determined the TPE contribution by measuring the ratio...
Bogdan Wojtsekhowski
(Jefferson Lab)
4/8/15, 4:30 PM
talk
The leading role of the handbag diagram contribution to the WACS
process at several GeV photon energy was established by JLab experiment E99-114.
At the same time, new data from E07-002 indicates significant corrections
which are not possible in the GPD approach.
A plan for a new high precision double polarized experiment with
100 times improved data taking productivity will be presented.
Ms
Lauren Ice
(Arizona State University)
4/8/15, 4:50 PM
talk
The OLYMPUS experiment will determine the multiple-photon exchange contribution to elastic lepton-proton scattering, the most likely candidate to resolve the discrepancy between measurements of the proton electric to magnetic form factor ratio, determined using the Rosenbluth separation technique and polarization transfer methods. To this end, the experiment measured the cross section ratio of...
Prof.
John Ralston
(University of Kansas)
4/8/15, 5:10 PM
talk
The proton charge radius measured in muonic hydrogen disagrees with other experiments by as much as seven standard deviations. However the “7σ” measure comes only from electronic hydrogen spectroscopy combined with many other data published by a single group. We perform an independent data analysis of the hydrogen spectrum that finds the charge radius rp = 0.87 ± 0.01. This result revises the...
