Journal Article PUBDB-2020-05309

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Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons

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2020
SISSA [Trieste]

Journal of high energy physics 2020(12), 010 () [10.1007/JHEP12(2020)010]
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Report No.: DESY-20-119; arXiv:2007.07755

Abstract: A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an extraction in a three-dimensional kinematic binning and enlarged phase space. They are complemented by corresponding results for the remaining four single-spin and four double-spin asymmetries allowed in the one-photon-exchange approximation of the semi-inclusive deep-inelastic scattering process for target-polarization orientation perpendicular to the direction of the incoming lepton beam. Among those results, significant non-vanishing $\cos(\phi−\phi_S)$ modulations provide evidence for a sizable worm-gear (II) distribution, $g_{1T}(x,p_T^2)$. Most of the other modulations are found to be consistent with zero with the notable exception of large $\sin(\phi_S)$ modulations for charged pions and $K^+$.

Keyword(s): electron p: deep inelastic scattering ; p: polarized beam ; polarization: transverse ; deep inelastic scattering: semi-inclusive reaction ; pi: leptoproduction ; lepton: scattering ; lepton: beam ; dimension: 3 ; spin: asymmetry ; modulation ; anti-p ; Sivers function ; phase space ; kinematics ; Collins ; HERMES ; DESY HERA Stor ; experimental results

Classification:

Contributing Institute(s):
  1. HERMES Kollaboration (HERMES)
Research Program(s):
  1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)
Experiment(s):
  1. HERA: HERMES

Appears in the scientific report 2020
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Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons
1-84 () [10.3204/PUBDB-2020-02984]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS


 Record created 2020-12-29, last modified 2025-07-29