Transverse spin transfer to $\Lambda$ and $\bar{\Lambda }$ hyperons in polarized proton-proton collisions at $\sqrt{s}=200\mathrm{GeV}$

Abstract

The transverse spin transfer from polarized protons to $\Lambda$ and $\bar{\Lambda }$ hyperons is expected to provide sensitivity to the transversity distribution of the nucleon and to the transversely polarized fragmentation functions. We report the first measurement of the transverse spin transfer to $\Lambda$ and $\bar{\Lambda }$ along the polarization direction of the fragmenting quark, $D_{\mathrm{TT}}$, in transversely polarized proton-proton collisions at $\sqrt{s}=200\mathrm{GeV}$ with the STAR detector at RHIC. The data correspond to an integrated luminosity of $18{\mathrm{pb}}^{-1}$ and cover the pseudorapidity range $\left|\eta \right|<1.2$ and transverse momenta $p_{\mathrm{T}}$ up to $8\mathrm{GeV}/c$. The dependence on $p_{\mathrm{T}}$ and $\eta$ are presented. The $D_{\mathrm{TT}}$ results are found to be comparable with a model prediction, and are also consistent with zero within uncertainties.

arXiv comment8 pages, 4 figures, version to appear in Physical Review D

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• The Spin Alignment of Vector Mesons in High Energy pp Collisions
• Measuring spin correlation between quarks during QCD confinement
• Deep Exclusive Meson Production as a probe to the puzzle of $\Lambda$ hyperon polarization
• Longitudinal and transverse spin transfer to $\Lambda$ and $\overline{\Lambda }$ hyperons in polarized $p$+$p$ collisions at $\sqrt{s}=200$ GeV
• Suppression of Spin Transfer to $\Lambda$ Hyperon in Deep-Inelastic Scattering
• Transverse Spin Transfer of $\Lambda$ and $\overline{\Lambda }$ Hyperons in Polarized $p$+$p$ Collisions at $\sqrt{s}=200$ GeV at RHIC-STAR
• Longitudinal and transverse spin transfer to $\Lambda$ and $\bar{\Lambda }$ hyperons in p+p collisions at STAR
• Heavy quark polarization anisotropy as a novel probe of fireball geometry
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