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

Abstract : 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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http://hal.in2p3.fr/in2p3-00837655
Contributor : Sylvie Flores <>
Submitted on : Monday, June 24, 2013 - 8:48:25 AM
Last modification on : Monday, June 15, 2020 - 3:00:02 PM

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B. I. Abelev, Magali Estienne, A. Geromitsos, S. Kabana, C. Roy, et al.. Longitudinal Spin Transfer to $\Lambda$ and $\bar{\Lambda}$ Hyperons in Polarized Proton-Proton Collisions at $\sqrt{s}$ = 200 GeV. Physical Review D, American Physical Society, 2009, 80, pp.111102. ⟨10.1103/PhysRevD.80.111102⟩. ⟨in2p3-00837655⟩

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