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PUBDB-2023-00197

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Latest Hermes results on azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic scattering by transversely polarized protons

Pappalardo, L. L. (Corresponding author) ; Schnell, G.Extern* ; HERMES Collaboration (Collaboration author)DESY*

2023
SISSA Trieste

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Please use a persistent id in citations: doi:10.22323/1.414.0783  doi:10.3204/PUBDB-2023-00197

Abstract: Azimuthal single- and double-spin asymmetries measured at HERMES in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from a transversely polarized hydrogen target are presented. The results of a re-analysis of the previously published Collins and Sivers asymmetries, extended to include protons and antiprotons as well as an extraction in a multi-dimensional binning and enlarged phase space, is reported along with the corresponding results for the remaining single- and double-spin asymmetries associated to the semi-inclusive deep-inelastic scattering process with a transversely polarized target. Among those results, significant non-vanishing ${\rm cos}(\phi − \phi_s)$ modulations provide evidence for a sizable worm-gear distribution $𝑔_{1𝑇}$ . Most of the other modulations are found to be consistent with zero with the notable exception of large ${\rm sin}(𝜙_s)$ modulations for charged pions and positively charged kaons.

Keyword(s): electron p: deep inelastic scattering ; deep inelastic scattering: semi-inclusive reaction ; polarization: transverse ; hydrogen: target ; pi: leptoproduction ; K: leptoproduction ; p: leptoproduction ; spin: asymmetry ; modulation ; anti-p: leptoproduction ; Sivers function ; HERMES ; DESY HERA Stor ; higher-dimensional ; Collins ; p: polarized target ; phase space ; experimental results

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Contributing Institute(s):

1. HERMES Kollaboration (HERMES)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. HERA: HERMES

Appears in the scientific report 2022

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Database coverage:
; ; ; ; DOAJ Seal

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