Speaker
Description
We investigate the transverse-spin asymmetry $A^{\sin\phi_\Lambda}_{UUT}$ for transversely polarized $\Lambda$ hyperon production in semi-inclusive deep inelastic scattering with an unpolarized lepton beam and an unpolarized nucleon target. In the collinear twist-3 framework, this observable is sensitive to the naive time-reversal-odd quark-gluon-quark fragmentation function $\tilde{D}_{T}$, which describes the correlation between an unpolarized fragmenting quark and the transverse polarization of the produced hadron.
The twist-3 fragmentation function $\tilde{D}_{T}$ is calculated using a spectator diquark model, with model parameters constrained by the leading-twist fragmentation functions $D_1$ and $G_1$. Combining the model result with the unpolarized parton distribution function $f_1$, we estimate the asymmetry in the kinematical regions relevant to EIC and EicC. The results show that the asymmetry can be sizable and is strongly affected by the strange-quark fragmentation contribution.
| 请选择分会 | 强子物理与味物理 |
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