[Olympus] Abstracts for the DPG spring conference in March in Mainz

[Michael Kohl]

Dear Colleagues,

please find below speaker nominations and abstracts for the DPG spring 
conference on March 19-23, 2012 in Mainz. We have permission for late 
submission of one group talk and two contributed talks. We will also 
try to put in a poster. Please send me any comments and suggestions as 
soon as possible. I am planning to submit the final abstracts before 
Monday.

Best regards
    Michael



"Das OLYMPUS-Experiment am DESY"
Alexander Winnebeck, MIT, Cambridge, Massachusetts, USA
for the OLYMPUS Collaboration
Group talk (in German)

Das am DESY in Hamburg betriebene OLYMPUS Experiment untersucht den 
Beitrag des Zweiphoton-Austauschs in elastischer Elektron-Protonstreuung 
durch Messung des Verhaeltnises der Wirkungsquerschnitte von elastischer 
Elektron- zu Positron-Proton-Streuung. 
Im DORIS Speicherring, der sowohl Elektronen- als auch Positronenstrahlen 
zur Verfuegung stellt, wurde ein internes H2-Gastarget installiert, 
welches von einem magnetischen Spektrometer mit groer Akzeptanz umgeben 
ist. In diesem Vortrag wird eine Uebersicht ueber die physikalische 
Motivation und den experimentellen Aufbau gegeben. Die erste Datennahme 
wurde im Februar 2012 beendet und erste vorlaeufige Ergebnisse werden 
ebenfalls praesentiert.


"OLYMPUS tracking"
Axel Schmidt, MIT, Cambridge, Massachusetts, USA
for the OLYMPUS collaboration
Contributed talk

The OLYMPUS Experiment, underway at DESY, in Hamburg, Germany, is
measuring the cross-section ratio between electron and positron 
elastic scattering from protons to definitively determine the two-photon 
contribution to lepton-proton scattering. Elastic events are selected by 
tracking the outgoing leptons and protons with a large acceptance magnetic 
spectrometer to determine the scattering angles, momenta, and vertex. Two 
large drift chambers each with 18 planes of sense wires are used to 
determine the particle trajectories. Hits in each sense wire plane are 
combined to form a three dimensional track through the detector. The 
design of the OLYMPUS drift chambers, as well as a description of the 
track reconstruction will be presented.


"OLYMPUS Luminosity Monitoring"
Ozgur Ates, Hampton University, Hampton, Virginia, USA
for the OLYMPUS collaboration
Contributed talk

The OLYMPUS experiment at DESY will measure the ratio of positron-proton 
and electron-proton elastic scattering cross sections to quantify the 
effect of two-photon exchange, which is widely considered to be 
responsible for the discrepancy between measurements of the proton 
electric to magnetic form factor ratio with the Rosenbluth and 
polarization transfer methods. In order to control the systematic 
uncertainties to the percent level, the luminosities are monitored 
redundantly with high precision by measuring the rates for symmetric 
Moller and Bhabha scattering, and by measuring the ep-elastic count rates 
at forward angles and low momentum transfer with tracking telescopes based 
on GEM (Gas Electron Multiplier) and MWPC (Multi Wire Proportional 
Chamber) technology. The production, installation, and commissioning of 
the OLYMPUS GEM luminosity monitors will be presented.



"The OLYMPUS Experiment at DESY"
to be presented by TBD
for the OLYMPUS collaboration
Poster presentation

The OLYMPUS experiment underway at the DESY laboratory in Hamburg 
will determine the two-photon contribution to electron-proton elastic 
scattering by measuring the cross section ratio between electron and 
positron elastic scattering from the proton. The experiment utilizes the 
storage ring DORIS at DESY with an internal gas target and a large 
acceptance magnetic spectrometer. An overview of the physics motivation 
for the experiment plus a description of the detector system will be 
presented. The first data run was completed in February, 2012 and 
preliminary results on the experimental operation and performance will 
also be discussed.



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| Dr. Michael Kohl, Assistant 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)
|
| Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
| Phone: +49-40-8998-6406, Cell: +49-171-101-1967
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