Deeply Virtual Compton Scattering off the neutron

Details Deeply Virtual Compton Scattering off the neutron Deeply Virtual Compton Scattering off the neutron

2007-09-04

arxiv.org/abs/0709.0450v2

Phys.Rev.Lett.99:242501,2007

Physics

Nuclear Physics

Nuclear Experiment

Published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.242501

The present experiment exploits the interference between the Deeply Virtual Compton Scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D$({\vec e},e'\gamma)X$ cross section measured at $Q^2$=1.9 GeV$^2$ and $x_B$=0.36. We extract a linear combination of generalized parton distributions (GPDs) particularly sensitive to $E_q$, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced.

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