Measurement of Target Spin Asymmetry of DVCS Using CLAS

Details Measurement of Target Spin Asymmetry of DVCS Using CLAS Measurement of Target Spin Asymmetry of DVCS Using CLAS

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.d7007c&link_type=abstract

American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #D7.007

Physics

Scientific paper

Preliminary results will be presented for the target spin asymmetry in exclusive Deeply Virtual Compton Scattering (DVCS). The asymmetry is the results of interference between the DVCS and the Bethe-Heitler amplitudes. The data were taken with the CLAS detector in Jefferson Lab's Hall B.A 5.7 GeV electron beam was directed onto an NH3 target, which was dynamically polarized parallel to the beam direction. The target polarization was on average 70%, and was frequently reversed for control of systematics. Data were also taken with C-12 targets. These data were used to subtract the unpolarized nitrogen background in the NH3 target sample. After background subtraction, the total event sample contained approximately 3000 single photon events in the hadronic mass range W = 1.8 - 3.0 GeV, and for photon virtualities from Q^2 = 1.5 to 4.5 GeV^2.

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