https://doi.org/10.1140/epjc/s10052-025-15193-8
Regular Article - Theoretical Physics
Helicity correlation of dihadron in current and target fragmentation regions of unpolarized SIDIS
1
School of Science, Shandong Jianzhu University, 250101, Jinan, Shandong, China
2
Department of Physics, University of Jyväskylä, P.O. Box 35, 40014, Jyvaskyla, Finland
3
Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland
4
Institute of Frontier and Interdisciplinary Science, Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, 266237, Qingdao, Shandong, China
a
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b
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c
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Received:
13
October
2025
Accepted:
10
December
2025
Published online:
22
December
2025
Abstract
We study the helicity correlation of two 
hyperons produced in unpolarized semi-inclusive deep inelastic scatterings (SIDIS), with one hyperon detected in the current fragmentation region and the other in the target fragmentation region. This observable provides direct access to the spin-dependent fragmentation function 
and the spin-dependent fracture function 
even in unpolarized lepton nucleon collisions. Utilizing the perturbative matching of the fracture function, we present numerical predictions for the helicity correlation, revealing significant variations with flavor and kinematic regions. This observable offers a unique way to investigate the spin-dependent hadronization mechanism across both the current and target fragmentation regions. It also provides new insights into the spin transfer effects in SIDIS processes.
© The Author(s) 2025
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Funded by SCOAP3.
