Speaker
Dr
Xiaoyan Zhao
Description
We study the longitudinal spin transfer of $\Lambda$-hyperon production in semi-inclusive deep inelastic scattering with both current and target fragmentation mechanisms. For existing fixed-target experiments, such as JLab and COMPASS, the events from the current region and those from the target fragmentation region are not clearly separated. We find that the contribution from the target fragmentation can significantly suppress the spin transfer to the $\Lambda$ measured at existing experiments. We also perform a model estimation to quantitatively demonstrate this effect and the results are compared with COMPASS data.
