Matching between TMD and twist-3 factorizations in the transversely polarized hyperon production

We focus on the origin of the transverse polarization of $\Lambda$ hyperon produced in the proton-proton collision which has been a mystery in high energy hadron reactions over the past half century. There are two different perturbative QCD frameworks for the description of the origin with respect to the size of the transverse momentum of the produced hyperon $P_{hT}$, transverse-momentum-dependent(TMD) factorization in small $P_{hT}$ and the collinear twist-3 factorization in high $P_{hT}$. We can consider the intermediate region of $P_{hT}$ where both frameworks are valid in semi-inclusive deep inelastic scattering and it was once shown that the TMD Boer-Mulders effect and the twist-3 distribution effect from the initial state proton give consistent cross section formulas in this region. We will here show that the consistency can be also found between the TMD polarizing fragmentation and the twist-3 fragmentation contributions generated by the polarized hyperon. This result supports the idea that the two frameworks describe a unique origin of the transverse polarization in different kinematic regions.

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Publication Details

Published
2024-12-27
DOI
https://doi.org/10.22323/1.469.0233
Primary Topic
Superconducting Materials and Applications
Type
article
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article

Matching between TMD and twist-3 factorizations in the transversely polarized hyperon production

Shinsuke Yoshida, Riku Ikarashi, Y. Koike
Superconducting Materials and Applications
article

Matching between TMD and twist-3 factorizations in the transversely polarized hyperon production

Shinsuke Yoshida, Riku Ikarashi, Y. Koike
article en

Abstract

We focus on the origin of the transverse polarization of $\Lambda$ hyperon produced in the proton-proton collision which has been a mystery in high energy hadron reactions over the past half century. There are two different perturbative QCD frameworks for the description of the origin with respect to the size of the transverse momentum of the produced hyperon $P_{hT}$, transverse-momentum-dependent(TMD) factorization in small $P_{hT}$ and the collinear twist-3 factorization in high $P_{hT}$. We can consider the intermediate region of $P_{hT}$ where both frameworks are valid in semi-inclusive deep inelastic scattering and it was once shown that the TMD Boer-Mulders effect and the twist-3 distribution effect from the initial state proton give consistent cross section formulas in this region. We will here show that the consistency can be also found between the TMD polarizing fragmentation and the twist-3 fragmentation contributions generated by the polarized hyperon. This result supports the idea that the two frameworks describe a unique origin of the transverse polarization in different kinematic regions.

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Matching between TMD and twist-3 factorizations in the transversely polarized hyperon production — Shinsuke Yoshida, Riku Ikarashi, et al. · (2024) | TGRS Research Map | TGRS