Speaker
Description
The transverse polarization of $\Lambda$ hyperons in unpolarized hadron--hadron reactions, first observed decades ago, is still not fully understood. The polarizing fragmentation functions, which are expected to contribute to the $\Lambda$ polarization, can be investigated by measuring the $\Lambda/\bar{\Lambda}$ transverse polarization inside jets in $pp$ collisions. In this contribution, we will present the status of our analysis on $\Lambda/\bar{\Lambda}$ polarization within jets based on $pp$ collisions at $\sqrt{s}=510\,\text{GeV}$ collected by the STAR detector at RHIC in 2017.Comparisons of the measurements at different energies in $pp$ collisions and $e^{+}e^{-}$ annihilation processes can probe the energy scale dependence and test the universality of the polarizing fragmentation functions.
