HERMES measurements of Collins and Sivers asymmetries from a transversely polarised hydrogen target
Markus Diefenthaler
TL;DR
This paper reports measurements of azimuthal single-spin asymmetries in semi-inclusive deep-inelastic scattering, revealing significant Collins and Sivers asymmetries using a transversely polarized hydrogen target at HERMES.
Contribution
It provides the first comprehensive measurement of Collins and Sivers asymmetries for pi and K mesons in this experimental setup.
Findings
Significant Collins asymmetries observed for pi and K mesons.
Notable Sivers asymmetries detected, indicating transverse momentum effects.
Results contribute to understanding nucleon spin structure.
Abstract
Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of pi-mesons and charged K-mesons in deep-inelastic scattering of positrons and electrons on a transversely polarised hydrogen target were observed. Significant SSA amplitudes for both the Collins and the Sivers mechanism are presented for the full data set recorded with transverse target polarisation at the HERMES experiment.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Particle Accelerators and Free-Electron Lasers