Transversity measurements at HERMES
Markus Diefenthaler (on behalf of the HERMES collaboration)
TL;DR
This paper reports measurements of azimuthal single-spin asymmetries in semi-inclusive deep-inelastic scattering, providing insights into the transversity distribution and spin-dependent fragmentation functions.
Contribution
It presents the first extraction of azimuthal moments for both Collins and Sivers mechanisms in charged pion production at HERMES, including subleading-twist contributions.
Findings
Observation of non-zero Collins and Sivers asymmetries
Quantitative evaluation of subleading-twist effects
Enhanced understanding of nucleon spin structure
Abstract
Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of charged pions in deep-inelastic scattering (DIS) of positrons on a transversely polarised hydrogen target are presented. Azimuthal moments for both the Collins and the Sivers mechanism are extracted. In addition the subleading-twist contribution due to the transverse spin component from SSA on a longitudinally polarised hydrogen target is evaluated.
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