We review recent theoretical and experimental progress on the role of two-photon exchange
(TPE) in electron–proton scattering at low to moderate momentum transfers. We make a …

The OLYMPUS Collaboration reports on a precision measurement of the positron-proton to
electron-proton elastic cross section ratio, R 2 γ, a direct measure of the contribution of hard …

The Bates Large Acceptance Spectrometer Toroid (BLAST) experiment was operated at the
MIT-Bates Linear Accelerator Center from 2003 until 2005. The experiment was designed to …

The OLYMPUS experiment was designed to measure the ratio between the positron–proton
and electron–proton elastic scattering cross-sections, with the goal of determining the …

Abstract The Jefferson Lab Q weak experiment determined the weak charge of the proton by
measuring the parity-violating elastic scattering asymmetry of longitudinally polarized …

We report a precision measurement of the deuteron tensor analyzing powers T 20 and T 21
at the MIT-Bates Linear Accelerator Center. Data were collected simultaneously over a …

An internal hydrogen target system was developed for the OLYMPUS experiment at DESY,
in Hamburg, Germany. The target consisted of a long, thin-walled, tubular cell within an …

The elastic electron-proton (ep) scattering and the spectroscopy of hydrogen atoms are the
two traditional methods to determine the proton charge radius (rp). In 2010, a new method …

We report the first measurement of the average of the electron-proton and positron-proton
elastic scattering cross sections. This lepton charge-averaged cross section is insensitive to …

The structure and algorithms of the Monte Carlo generator ELRADGEN 2.0 designed to
simulate radiative events in polarized ep-scattering are presented. The full set of analytical …