Measurements of the Electron-Helicity Dependent Cross Sections of Deeply Virtual Compton Scattering with CEBAF at 12 GeV
/ Authors
J. Roche, C. Hyde-Wright, B. Michel, C. Camacho, G. Gavalian, M. Amarian, S. Bültmann, G. Dodge, H. Juengst, J. Lachniet
and 46 more authors
A. Radyushkin, P. Ulmer, L. Weinstein, J. Ball, P. Bertin, M. Brossard, R. D. Masi, M. Garçon, F. Girod, M. Guidal, M. Cormick, Malek Mazouz, S. Niccolai, B. Pire, S. Procureur, F. Sabatié, E. Voutier, S. Wallon, A. Camsonne, J. Chen, E. Chudakov, A. Deur, D. Gaskell, D. Higinbotham, C. Jager, J. Lerose, O. Hansen, R. Michaels, S. Nanda, A. Saha, S. Stepanyan, B. Wotjtsekhowski, P. Markowitz, X. Zheng, R. Gilman, X. Jiang, E. Kuchina, R. Ransome, A. Deshpande, N. Liyanage, Seonho Choi, H. Kang, Byungwuek Lee, Y. Oh, Jong-Min Song, S. Širca
/ Abstract
We propose precision measurements of the helicity-dependent and helicity independent cross sections for the ep->epg reaction in Deeply Virtual Compton Scattering (DVCS) kinematics. DVCS scaling is obtained in the limits Q^2>>Lambda_{QCD}^2, x_Bj fixed, and -\Delta^2=-(q-q')^2 2 GeV, and -\Delta^21 GeV^2. We will use our successful technique from the 5.75 GeV Hall A DVCS experiment (E00-110). With polarized 6.6, 8.8, and 11 GeV beams incident on the liquid hydrogen target, we will detect the scattered electron in the Hall A HRS-L spectrometer (maximum central momentum 4.3 GeV/c) and the emitted photon in a slightly expanded PbF_2 calorimeter. In general, we will not detect the recoil proton. The H(e,e'g)X missing mass resolution is sufficient to isolate the exclusive channel with 3% systematic precision.
Journal: arXiv: Nuclear Experiment