DVCS

The DVCS2 experiments at Jefferson Lab (LH2: E07-007, [1], LD2: E08-025 [2]) will measure the absolute cross sections of electro-production of photons in the deep exclusive regime as part of the GPD program. These experiments build on the success of our first round of data taking ([3], [4]). DVCS measurements at fixed Q², x_Bj and three different beam energies will be measured. The kinematic structure of the ep→ epγ cross section will allow to separate the different amplitudes contributing to the total cross section (eg. BH*DVCS interference from the pure |DVCS|²) term at all three Q₂ values of the previous experiments. Rosenbluth L/T separations of the ep→ epπ⁰ cross section, which is crucial to testing that factorization in this channel will be obtained. A key element of the experiments is the EM calorimeter that is used to detect the photon while the Hall A HRS is used to detect the scattered electron.

The upcoming data taking is scheduled from September 27, 2010 to December 28, 2010.