Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Hadronenstruktur und -spektroskopie

HK 61.3: Talk

Friday, March 23, 2012, 14:45–15:00, RW 1

Symmetric Moller/Bhabha luminosity monitor for the Olympus experiment — •Perez Benito Roberto Francisco — Helmholtz-Institut Mainz

Recent determinations of the proton electric to magnetic form factor ratio indicate an unexpected discrepancy between the obtained ratio using polarization transfer measurements and the ratio from Rosenbluth separation technique in unpolarized cross section measurements. This discrepancy has been explained as the effect of two-photon exchange. OLYMPUS experiment at DESY has been proposed to measure the ratio of positron-proton and electron-proton elastic scattering cross sections. The experiment will utilize intense beams of electrons and positrons in the DORIS ring incident on an internal hydrogen gas target. Results of the performance of the Symmetric Moller and Bhabha Luminosity Monitor will be presented in this contribution together with the physics case for the OLYMPUS and the current status of the project.