Computer Science
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009fuin.conf..269k&link_type=abstract
FUNDAMENTAL INTERACTIONS . Proceedings of the 23rd Lake Louise Winter Institute 2008 . Held 18 - 23 February 2008 in Lake Louise
Computer Science
Scientific paper
The HERMES experiment has an extensive experimental programme to study Generalised Parton Distributions (GPDs) in Deeply Virtual Compton Scattering (DVCS) and hard exclusive production of scalar and vector mesons. The most recent results concern azimuthal DVCS asymmetries measured with a transversely polarised hydrogen target. From the same data set new results for the beam-charge asymmetry are also extracted with better precision than those previously reported. By comparing model calculations with measured asymmetries attributed to the interference between the deeply virtual Compton scattering and Bethe-Heitler processes, a model-dependent constraint is obtained on the total angular momenta carried by up and down quarks in the nucleon. A detailed description of the results can be found in a recent HERMES paper1.
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