Abstract
The HERMES experiment at DESY in Hamburg collected semi-inclusive deep-inelastic scattering data using the 27.6 GeV HERA lepton beam and various gaseous light and nuclear targets. Results of charge-separated hadron-identified multiplicities and multiplicity ratios, measured on light and heavier targets, are shown as well as azimuthal moments measured from unpolarized hydrogen and deuterium targets. Furthermore, Sivers and Collins amplitudes, extracted from measurements on a transversely polarized hydro- gen target, are presented.
Highlights
The HERMES experiment at DESY in Hamburg (Germany) has studied meson production in semiinclusive deep-inelastic scattering (DIS) for over a decade
Results of charge-separated hadron-identified multiplicities and multiplicity ratios, measured on light and heavier targets, are shown as well as azimuthal moments measured from unpolarized hydrogen and deuterium targets
Multiplicities and multiplicity ratios were extracted from HERMES data in multi-dimensional kinematic bins, and are presented in sections 2 and 3, respectively
Summary
The HERMES experiment at DESY in Hamburg (Germany) has studied meson production in semiinclusive deep-inelastic scattering (DIS) for over a decade. Extending the analysis of semi-inclusive DIS data to the non-collinear distribution of hadrons, i.e., taking into consideration their azimuthal distribution, provides access to the Collins fragmentation function [1], which describes the fragmentation of a transversely polarized quark into an unpolarized hadron. It enters the semi-inclusive DIS cross section in convolution with the Boer-Mulders distribution function [2]. The transversity distribution describes the distribution of transversely polarized quarks in a transversely polarized nucleon
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