Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-06-23
Phys.Rev.C79:015201,2009
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 5 figures, Bibtex format, to be submitted to Physical Review Letters includes cross section tables
Scientific paper
10.1103/PhysRevC.79.015201
We have made the first measurements of the virtual Compton scattering process via the e p -> e p gamma exclusive reaction at Q**2 = 1 GeV**2 in the nucleon resonance region. The cross section is obtained at center of mass (CM) backward angle, theta_gamma_gamma*, in a range of total (gamma* p) CM energy W from the proton mass up to W = 1.91 GeV. The data show resonant structures in the first and second resonance regions, and are well reproduced at higher W by the Bethe-Heitler+Born cross section, including t-channel pi0-exchange. At high W, our data, together with existing real photon data, show a striking Q**2 independence. Our measurement of the ratio of H(e,e'p)gamma to H(e,e'p)pi0 cross sections is presented and compared to model predictions.
for the JLab Hall A Collaboration
Laveissière G.
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