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

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

2009-10-08

arxiv.org/abs/0910.1428v1

Phys.Rev.D80:111102,2009

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures

Scientific paper

10.1103/PhysRevD.80.111102

The longitudinal spin transfer, $D_{LL}$, from high energy polarized protons to $\Lambda$ and $\bar{\Lambda}$ hyperons has been measured for the first time in proton-proton collisions at $\sqrt{s} = 200 \mathrm{GeV}$ with the STAR detector at RHIC. The measurements cover pseudorapidity, $\eta$, in the range $|\eta| < 1.2$ and transverse momenta, $p_\mathrm{T}$, up to $4 \mathrm{GeV}/c$. The longitudinal spin transfer is found to be $D_{LL}= -0.03\pm 0.13(\mathrm{stat}) \pm 0.04(\mathrm{syst})$ for inclusive $\Lambda$ and $D_{LL} = -0.12 \pm 0.08(\mathrm{stat}) \pm 0.03(\mathrm{syst})$ for inclusive $\bar{\Lambda}$ hyperons with $<\eta> = 0.5$ and $ = 3.7 \mathrm{GeV}/c$. The dependence on $\eta$ and $p_\mathrm{T}$ is presented.

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