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We report the first results of the beam spin asymmetry measured in thereaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetrywith a sin(phi) modulation is observed, as predicted for the interference termof Deeply Virtual Compton Scattering and the Bethe-Heitler process. Theamplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order andleading-twist pQCD, the alpha is directly proportional to the imaginary part ofthe DVCS amplitude.Comment: 6 pages, 5 figure

Observation of Exclusive Deeply Virtual Compton Scattering in Polarized Electron Beam Asymmetry Measurements