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6th Workshop of the APS Topical Group on Hadronic Physics

Apr 8 – 10, 2015
Baltimore, MD
US/Eastern timezone

ghpworkshops@gmail.com

Session

Electron Scattering 1

Apr 8, 2015, 4:00 PM
Baltimore, MD

Baltimore, MD

Hilton Baltimore Inner Harbor

Conveners

Electron Scattering 1

  • Guy Ron (Hebrew University of Jerusalem)

Presentation materials

There are no materials yet.

  1. 70. Towards a resolution of the proton form factor problem: new electron and positron scattering data
    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...
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  2. 20. On the reaction mechanism of the Wide Angle Compton Scattering from the proton
    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.
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  3. 37. Status of the OLYMPUS Experiment
    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...
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  4. 51. An Independent Spectroscopic Data Analysis of the Proton Size Puzzle
    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...
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