Burns, Jonathan R.T.
Deeply Virtual Compton Scattering off an unpolarised hydrogen target at HERMES.
PhD thesis, University of Glasgow.
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Deeply Virtual Compton Scattering (DVCS) is the simplest interaction that
allows access to Generalised Parton
Distributions (GPDs), a theoretical framework describing nucleon
structure. The strong
interest in GPDs results from the fact that they can be used to determine the total
angular momentum of quarks
inside the nucleon and provide a 3-dimensional picture of nucleon structure. The
measurement of the DVCS
process is facilitated by the interference with a competing interaction known as the Bethe-Heitler process which
has the same final state. DVCS information is obtained from the asymmetrical in distribution of the real photon
around the azimuthal angle $\phi$ at HERMES.
Beam charge and beam helicity asymmetries, extracted from DVCS events with an unpolarised hydrogen target
recorded during the 2006-2007 and 1996-2007 data taking periods, are presented in this thesis.
The asymmetry amplitudes
are presented over the range of HERMES kinematic acceptance, with their dependence on
t, xB and Q^2 also shown and compared to a phenomenological model.
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