Measurements of Double-Spin Asymmetries in SIDIS of Longitudinally Polarized Leptons off Transversely Polarized Protons
L.L. Pappalardo, M. Diefenthaler (for the HERMES Collaboration)
TL;DR
This paper presents a Fourier analysis of double-spin asymmetries in semi-inclusive deep-inelastic scattering, revealing insights into transverse momentum-dependent distributions and fragmentation functions, including the less understood worm-gear quark distribution.
Contribution
It introduces a Fourier analysis method for azimuthal asymmetries in SIDIS, providing new experimental data on transverse momentum-dependent functions.
Findings
Measured asymmetry amplitudes for pions and kaons.
Sensitivity to the worm-gear quark distribution.
Enhanced understanding of transverse momentum-dependent functions.
Abstract
A Fourier analysis of double-spin azimuthal asymmetries measured at HERMES in semi-inclusive deep-inelastic scattering of longitudinally polarized leptons off tranversely polarized protons is presented for pions and charged kaons. The extracted amplitudes can be interpreted as convolutions of transverse momentum-dependent distribution and fragmentation functions and provide sensitivity to, e.g., the poorly known worm-gear quark distribution.
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Taxonomy
TopicsAtomic and Subatomic Physics Research · Particle physics theoretical and experimental studies · Particle Accelerators and Free-Electron Lasers