Evidence for virtual Compton scattering from the proton

Creators: van den Brand, J. F. J.; Arrington, J.; Beise, E. J.; Belz, J. E.; Filippone, B. W.; Gao, H.; McKeown, R. D.; Mueller, B.; O'Neill, T. G.

Abstract

In virtual Compton scattering an electron is scattered off a nucleon such that the nucleon emits a photon. We show that these events can be selected experimentally, and present the first evidence for virtual Compton scattering from the proton in data obtained at the Stanford Linear Accelerator Center. The angular and energy dependence of the data is well described by a calculation that includes the coherent sum of electron and proton radiation.

Additional Information

© 1995 The American Physical Society. Received 4 April 1995; published in the issue dated 1 November 1995. This work was supported in part by the Department of Energy under Contracts No. W-31-109-ENG-38 (Argonne), No. DE-FG02-86ER40269 (Colorado), No. W-2705-Eng-48 (LLNL), No. DE-AC02-76ER03069 (MIT), No. DE-AC03-76SF00515 (SLAC), No. DEFG03- 88ER40439 (Stanford) and by the National Science Foundation under Grants No. PHY-9014406 and No.PHY-9114958 (American), No. PHY-9115574 (Caltech), No. PHY-9101404 (CSLA), No. PHY-9208119 (RPI), No. PHY-9316221 (Wisconsin). R.G.M. acknowledges the support from the NSF Presidential Young Investigator program. B.W.F. acknowledges the support of the Sloan Foundation.

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