# T-odd quark fragmentation function and transverse spin asymmetries in the pion production

Source: [T-odd quark fragmentation function and transverse spin asymmetries in the pion production](<https://www.sota2.com/research/paper/68fa2a3f1e209131ce83bd88>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-27T03:14:19.264Z

Authors: K. Suzuki

Published: 2000-02-21T10:45:32.000Z

## Abstract

We study the time-reversal odd quark fragmentation function and its consequences on the hard processes. T-odd quark fragmentation function may arise, although QCD is T-invariant, from the non-perturbative dynamics in the fragmentation process. Assuming the factorization, we extract the T-odd fragmentation function from the inclusive pion production in the transversely polarized proton-proton collision. We then estimate the single spin asymmetry $A\_{OT}$ of the semi-inclusive deep inelastic scattering with unpolarized lepton and the transversely polarized proton. We also discuss the meson cloud effects on the transversity distribution $h\_1(x)$ of the nucleon. Asymmetry for the $\\pi^-$ production is found to be much smaller than the naive expectation, since the $d$-quark transversity is considerably suppressed by the pion cloud effects

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ph/0002218>)

[PDF](<https://arxiv.org/pdf/hep-ph/0002218.pdf>)