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A New Derivation of the Twist-3 Gluon Fragmentation Contribution to Polarized Hyperon Production

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arxiv 2206.14965 v1 pith:T2747K4G submitted 2022-06-30 hep-ph

Riku Ikarashi , Yuji Koike , Kenta Yabe , Shinsuke Yoshida This is my paper · ORCID
classification hep-ph
keywords twist-3contributioncrossfragmentationgluonhyperonmethodsection
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A novel method of formulating the twist-3 gluon fragmentation function contribution to hyperon polarization in the proton-proton collision is presented. The method employs a covariant gauge and takes full advantage of the Ward-Takahashi identities before performing the collinear expansion. It provides a robust way of constructing the general cross section formula, and also a clear understanding for the absence of the ghost-like terms in the twist-3 cross section in the leading order with respect to the QCD coupling constant.

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  1. Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference

    hep-ph 2025-01 conditional novelty 7.0 of 10

    A new Pomeron-Odderon interference term in the hybrid CGC framework yields a percent-level transverse single spin asymmetry in forward pA collisions, with a characteristic sign-changing node at the saturation scale.

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