PoS - Proceedings of Science
Volume 469 - 31st International Workshop on Deep Inelastic Scattering (DIS2024) - WG5: Spin and 3D Structure
Matching between TMD and twist-3 factorizations in the transversely polarized hyperon production
Y. Shinsuke*, R. Ikarashi and Y. Koike
Full text: pdf
Pre-published on: December 27, 2024
Published on:
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.
DOI: https://doi.org/10.22323/1.469.0233
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