Abstract
The concept of Generalized Parton Distributions (GPDs) combines two-dimensional spatial information given by form factors, with longitudinal momentum information from Parton Distribution Functions. GPDs provide comprehensive description of the nucleon structure involving a wealth of new information. For instance, according to Ji’s sum rule, the GPDs [Formula: see text] and [Formula: see text] enable access to the total angular momenta of quarks, antiquarks and gluons. While [Formula: see text] can be approached using measurements of electroproduction cross sections, asymmetry measurements in hard exclusive meson production off transversely polarized targets can help to constrain the GPD [Formula: see text] and chiral-odd GPDs. In 2007 and 2010 the COMPASS experiment at CERN collected data by scattering a [Formula: see text] muon beam off a transversely polarized NH3 target. Exclusive vector-meson production [Formula: see text] with a [Formula: see text] or [Formula: see text] meson in the final state is studied and five single-spin and three double-spin azimuthal asymmetries are measured.
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