Longitudinal Spin Transfer to $Λ$ and $\barΛ$ in Polarized Proton-Proton Collisions at $\sqrt{s} = 200 Gev at Star

Abstract

We report our measurement on longitudinal spin transfer, $D_{LL}$, from high energy polarized protons to $Λ$ and $\barΛ$ hyperons in proton-proton collisions at $\sqrt{s} = 200GeV$ with the STAR detector at RHIC. The measurements cover $Λ$, $\barΛ$ pseudorapidity $|η| < 1.2$ and transverse momenta $p_T$ up to $4GeV/c$. The longitudinal spin transfer is found to be $D_{LL}= -0.03\pm 0.13(stat) \pm 0.04(syst)$ for inclusive $Λ$ and $D_{LL} = -0.12 \pm 0.08(stat) \pm 0.03(syst)$ for inclusive $\barΛ$ hyperons with $<η> = 0.5$ and $ = 3.7GeV/c$. The prospect on transverse spin transfer measurement is also given.