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Reviewing model calculations of the Collins fragmentation function

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arxiv hep-ph/0504124 v1 pith:Z2X67UVG submitted 2005-04-15 hep-ph

classification hep-ph
keywords collinsfunctioncalculationsdifferentfragmentationmodelmodelssome
verification ladder T0 review T1 audit T2 compute T3 formal
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The Collins fragmentation function describes a left/right asymmetry in the fragmentation of a transversely polarized quark into a hadron in a jet. Four different model calculations of the Collins function have been presented in the literature. While based on the same concepts, they lead to different results and in particular to different signs for the Collins function. The purpose of the present work is to review the features of these models and correct some errors made in previous calculations. A full study of the parameter dependence and the possible modifications to these models is beyond the scope of the paper. However, some general conclusions are drawn.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Single spin asymmetry $A _ { U L } ^ { \sin ( 3 \phi _ { h } - \phi_{ R } ) }$ in dihadron production in SIDIS

    hep-ph 2025-09 conditional novelty 6.0 of 10

    A one-loop spectator-model calculation of the previously uncalculated T-odd dihadron fragmentation function predicts a near-zero sin(3phi_h-phi_R) asymmetry at COMPASS and HERMES, matching the weak observed signal.

  2. T-odd transverse momentum dependent gluon distributions for tensor polarized deuteron in a spectator model

    hep-ph 2026-07 conditional novelty 5.0 of 10

    Six leading-twist T-odd gluon TMDs of a tensor-polarized deuteron are derived analytically and evaluated numerically in a spectator model with single-gluon final-state interaction.

  3. Off-shell modifications of the pion generalized parton distributions and transverse momentum dependent parton distributions

    hep-ph 2025-07 conditional novelty 5.0 of 10

    In the NJL model, off-shell pion GPDs and TMDs differ from on-shell ones by 15 to 25 percent and acquire new odd-power form factors from broken crossing symmetry.

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