TITLE

Polarization observables in Wide Angle Compton Scattering

AUTHOR(S)
Wojtsekhowski, Bogdan B.
PUB. DATE
June 2001
SOURCE
AIP Conference Proceedings;2001, Vol. 570 Issue 1, p566
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The physics of Wide Angle Compton Scattering (WACS) from the proton was addressed in a pioneering experiment performed at Cornell in 1979. The process was analyzed in the pQCD framework. The general features of pQCD predictions were found in agreement with the experiment. However, detailed calculations got a cross section smaller by a factor of five-ten than from the experiment, for most models of nucleon distribution amplitudes. This raised a question of the origin of the scaling and the appropriate mechanism of WACS. Recently WACS attracted considerable attention because of its connection to the novel concept of skewed patton distributions. The progress of theory and expected soon an experiment will allow clarification of the mechanism of WACS process at s,-t,-u in the range of 5 -10 GeV². Experiment E99-114 will be done at photon energy up to 6 GeV and large angles (from 60 up to 130 degrees in cms). In comparison with the only existing previous measurement the counting rate in our experiment will be 300 times higher. Such gain in luminosity results from a combination of the 100% duty factor of CEBAF, high segmentation and resolution of the photon detector, and successful use of the mixed photon/electron beam. The dominant mechanism of WACS will be investigated through s and t dependence of the cross section and by using polarization transfer from photon to proton. Presently, we are studying the possibility to measure the effect of photon linear polarization.
ACCESSION #
6310219

 

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