[Olympus] Abstract for an invited talk at MESON2014 in Krakow, May 29-June 3, 2014

[Michael Kohl]

Dear Colleagues,
I have been invited for a talk on form factors, two-photon exchange and 
OLYMPUS at MESON2014 in Krakow, Poland, May 29-June 3, 2014.
Since this is considered a review talk and not only on OLYMPUS, the 
organizers wanted me personally to present it.

The abstract deadline is March 23, 2014. See the draft below, please send 
me any comments by Thursday March 20, 2014.

Thanks and best regards
   Michael


"EM Form Factors and OLYMPUS"

Abstract:
The elastic form factors characterize the distributions of charge and
magnetization in momentum space and are important input for calculations 
of strong interaction phenomena and nuclear structure. The dramatic 
discrepancy in the observed ratio of elastic proton form factors between 
the Rosenbluth separation and polarization transfer methods has invoked 
numerous theoretical and experimental investigations. The previously 
neglected effect from two-photon exchange has become the favored 
explanation for the discrepancy. While the effect can not be calculated 
from first principles, it can be verified experimentally in several ways, 
most stringently by comparing the positron-proton and electron-proton 
elastic cross sections.
The OLYMPUS experiment at DESY has been carried out to quantify the
effect of two-photon exchange using intense stored positron and
electron beams along with an internal unpolarized hydrogen target and
a large acceptance detector to measure the ratio of the positron-proton
and electron-proton elastic scattering cross sections.
I will present the status of form factor measurements and of the
experimental efforts to verify the effect of two-photon exchange, with
some emphasis on the OLYMPUS experiment.



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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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