Deeply Virtual Compton Scattering off an unpolarised hydrogen target at HERMES

QC Physics

Burns, Jonathan R.T. ; Seitz, Bjoern

University:University of Glasgow

Department:School of Physics and Astronomy

关键词: Deeply Virtual Compton Scattering, HERMES, Nuclear Physics, Particle Physics, Nucleon Structure,;   

Others  :  http://theses.gla.ac.uk/2057/1/2010Burnsphd.pdf

来源: University of Glasgow

【 摘 要 】

Deeply Virtual Compton Scattering (DVCS) is the simplest interaction thatallows access to Generalised PartonDistributions (GPDs), a theoretical framework describing nucleonstructure. The stronginterest in GPDs results from the fact that they can be used to determine the totalangular momentum of quarksinside the nucleon and provide a 3-dimensional picture of nucleon structure. Themeasurement of the DVCSprocess is facilitated by the interference with a competing interaction known as the Bethe-Heitler process whichhas 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 amplitudesare presented over the range of HERMES kinematic acceptance, with their dependence onkinematic variablest, xB and Q^2 also shown and compared to a phenomenological model.