XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects

Longitudinal and Transverse Spin Transfer of Λ and Λ― Hyperons in Polarized p+p Collisions at s=200 GeV at RHIC-STAR

15 Apr 2021, 10:00

18m

Virtual (Stony Brook, NY)

Contributed Talk Spin Physics Spin Physics

Speaker

Mr Yike Xu (Shandong University)

Description

Since the first surprising results on the spin structure of the proton by the EMC experiment in the late 1980s, much progress has been made in understanding the origin of the proton spin. However, the sea quark contribution to the proton spin, for example, the polarized distributions of the strange quark(anti-quark), s($\overline{s}$), is still not well constrained by experimental data. Since the s($\overline{s}$) is expected to carry a substantial fraction of the spin of the $\mathrm{\Lambda }$($\overline{\mathrm{\Lambda }}$) hyperon, measurements of the longitudinal spin transfer, $D_{LL}$, and the transverse spin transfer, $D_{TT}$ of the $\mathrm{\Lambda }$($\overline{\mathrm{\Lambda }}$) hyperon in polarized proton-proton collisions can thus shed light ̄on the helicity and transversity distriubtions of the s($\overline{s}$) in the proton. In this talk, we will present the status of the $\mathrm{\Lambda }$($\overline{\mathrm{\Lambda }}$) $D_{LL}$ and $D_{TT}$ analyses using data collected at RHIC-STAR experiment in 2015, for the $\mathrm{\Lambda }$($\overline{\mathrm{\Lambda }}$) hyperon of pseudo-rapidity |$\eta$| < 1.2 and transverse momenta up to 8.0 GeV/c. This dataset is about twice as large as that used for the previously published $D_{LL}$ and $D_{TT}$ results.

Presentation materials

DIS_20210412_Meeting_xuyike_ver17.pdf

Youtube Link