[Olympus] Abstract for OLYMPUS poster at PSAS2016

[Michael Kohl]

Dear all,

please see the draft abstract below for a poster on OLYMPUS to be 
presented at PSAS2016 in Jerusalem in May.

It needs to be submitted before April 21.
Please send me any comments until end of Tuesday April 19.

Thanks and best regards
   Michael


The OLYMPUS Experiment at DESY

The proton is not an elementary particle but has a substructure
governed by quarks and gluons. The spatial distributions of the electric 
charge and magnetization determine the response to electromagnetic interaction.
Recently, it has been demonstrated that the observed difference in the elastic
eletric-to-magnetic proton form factor ratio with unpolarized and polarized 
methods can be explained by hard two-photon exchange as a radiative correction
previously unaccounted for. Calculations of this correction are model-dependent
and need to be validated with precision measurements.
The most direct verification is a comparison of positron-proton and 
electron-proton elastic scattering. The OLYMPUS experiment at DESY was 
designed to make a definitive, high precision measurement of the elastic 
e+p/e-p cross section ratio, in order to provide an end to the controversy.
The status of the OLYMPUS experiment and analysis will be reported.


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| Dr. Michael Kohl, Associate Professor and Staff Research Scientist
| Physics Department, Hampton University, Hampton, VA 23668
| Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
| Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
| Fax:   +1-757-728-6910 (HU), +1-757-269-7363 (Jlab)
| Email: kohlm at jlab.org, Cell: +1-757-256-5122 (USA)
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