Abstract
The HERMES experiment has collected a wealth of deep-inelastic scattering data using the 27.6 GeV polarized lepton beam at HERA and various pure gas targets, both unpolarized and polarized. This allowed for a series of diverse and unique measurements. Among them are measurements that provide information on the threedimensional structure of the nucleon, both in momentum space and in position space. Results of measurements of exclusive ω production on an unpolarized and transversely polarized nucleon target, sensitive to the distribution in transverse-position and longitudinalmomentum space, are discussed as well as the three-dimensional extraction of azimuthal asymmetries measured in semi-inclusive deep-inelastic scattering, sensitive to twist-2 and twist-3 distributions in three-dimensional momentum space.
Highlights
Results of measurements of exclusive ω production on an unpolarized and transversely polarized nucleon target, sensitive to the distribution in transverse-position and longitudinalmomentum space, are discussed as well as the three-dimensional extraction of azimuthal asymmetries measured in semi-inclusive deep-inelastic scattering, sensitive to twist-2 and twist-3 distributions in three-dimensional momentum space
The HERMES experiment was a fixed-target experiment located around the HERA accelerator at DESY in Hamburg (Germany)
The study of exclusive ω production is sensitive to generalized parton distributions (GPDs) and offers a means to study the three-dimensional structure of the nucleon
Summary
The HERMES experiment was a fixed-target experiment located around the HERA accelerator at DESY in Hamburg (Germany). It took data from 1995 until 2007 by scattering longitudinally polarized electrons or positrons off a stationary gas target, internal to the beam pipe. The last two years of data collection got complemented by the installation of a recoil detector, located around the target, in order to detect low-energetic particles, outside of the acceptance of the forward spectrometer. Measurements of exclusive ω production on transversely polarized and unpolarized hydrogen as well as on unpolarized deuterium are discussed
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