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

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

2009-12-17

arxiv.org/abs/0912.3353v1

Physics

High Energy Physics

High Energy Physics - Experiment

Talk given at XIII workshop on high energy spin physics (DSPIN-09), Dubna, Russia, 1-5 September 2009

Scientific paper

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

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