Observation of exclusive DVCS in polarized electron beam asymmetry measurements

Preprint

18 September 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ex/0107043

Abstract

We report the first results of the beam spin asymmetry measured in the reaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetry with a sin(phi) modulation is observed, as predicted for the interference term of Deeply Virtual Compton Scattering and the Bethe-Heitler process. The amplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order and leading-twist pQCD, the alpha is directly proportional to the imaginary part of the DVCS amplitude.

Keywords

ASYMMETRY MEASURED
POLARIZED ELECTRON
BEAM ASYMMETRY
EXCLUSIVE DVCS
SCATTERING
TWIST

All Related Versions

Version 1, 2001-07-18, ArXiv
Version 2, 2001-09-14, ArXiv
Version 3, 2001-09-18, ArXiv
Published version: Physical Review Letters, 87 (18), 182002.

This publication has 0 references indexed in Scilit: