Longitudinal and Transverse Spin Transfer of $\Lambda$ and $\overline{\Lambda }$ Hyperons in Polarized $p$+$p$ Collisions at $\sqrt{s}=200$ GeV at RHIC-STAR

Abstract

Measurements of the longitudinal spin transfer, $D_{LL}$, and the transverse spin transfer, $D_{TT}$, of the $\Lambda (\bar{\Lambda }$) hyperon in polarized $p$+$p$ collisions are expected to be sensitive to the helicity distribution and transversity distribution of the $s(\bar{s})$ quark in proton and the corresponding polarized fragmentation functions. This contribution presents the new preliminary results of the $\Lambda (\bar{\Lambda }$) $D_{LL}$ and $D_{TT}$ using data collected at RHIC-STAR experiment in 2015, with twice larger statistics than previously published results.

arXiv commentSubmission to SciPost Proceedings