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Sep 24 – 29, 2023
US/Eastern timezone

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

Sep 26, 2023, 10:00 AM
15m
Meeting Room 1-2 (Durham Convention Center)

Meeting Room 1-2

Durham Convention Center

Talk 3D Structure of the Nucleon: TMDs 3D Structure of the Nucleon: TMDs

Speaker

Prof. Qinghua Xu (Shandong University)

Description

The longitudinal and transverse spin transfer to $\Lambda$ and $\overline{\Lambda}$ hyperons in polarized proton-proton collisions is expected to be sensitive to the helicity and transversity distributions of strange and anti-strange quarks of the proton, as well as the corresponding polarized fragmentation functions. In this talk, we will present the improved measurements of longitudinal spin transfer to $\Lambda$ and $\overline{\Lambda}$, $D_{LL}$, and transverse spin transfer to $\Lambda$ and $\overline{\Lambda}$, $D_{TT}$, in polarized proton-proton collisions at $\sqrt{s} = 200$ GeV with the STAR experiment at RHIC. The data set includes longitudinally and transversely polarized proton-proton collision samples with an integrated luminosity of 52 pb$^{-1}$ in each cases. Both data sets have about two times larger figure of merit than prior results and cover a kinematic range of $|\eta|$ $<$ 1.2 and transverse momentum $p_T$ up to 8 GeV/$c$. We also report first measurements of the hyperon spin transfer $D_{LL}$ and $D_{TT}$ versus fractional momentum $z$ of the hyperon within a jet, which can provide more direct constraints on the polarized fragmentation functions.

Primary author

Yike Xu (Shandong University)

Presentation materials