Longitudinal Spin Transfer to the $\Lambda$ Hyperon in Semi-Inclusive Deep-Inelastic Scattering

Abstract

The transfer of polarization from a high-energy positron to a \lam hyperon produced in semi-inclusive deep-inelastic scattering has been measured. The data have been obtained by the HERMES experiment at DESY using the 27.6 GeV longitudinally polarized positron beam of the HERA collider and unpolarized gas targets internal to the positron (electron) storage ring. The longitudinal spin transfer coefficient is found to be $\dll = 0.11 \pm 0.10 \mathrm{(stat)} \pm 0.03 \mathrm{(syst)}$ at an average fractional energy carried by the \lam hyperon $<z>=0.45$. The dependence of \dll on both the fractional energy $z$ and the fractional longitudinal momentum $x_F$ is presented.

References in corpus (22)

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Cited by in corpus (24)

• Parton Fragmentation Functions
• A Fixed-Target Programme at the LHC: Physics Case and Projected Performances for Heavy-Ion, Hadron, Spin and Astroparticle Studies
• Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS
• Longitudinal Spin Transfer to $\Lambda$ and $\bar{\Lambda }$ Hyperons in Polarized Proton-Proton Collisions at $\sqrt{s}$ = 200 GeV
• Polarized hyperon production in single-inclusive electron-positron annihilation at next-to-leading order
• Transverse spin transfer to $\Lambda$ and $\bar{\Lambda }$ hyperons in polarized proton-proton collisions at $\sqrt{s}=200\mathrm{GeV}$
• Improved measurement of the longitudinal spin transfer to $\Lambda$ and $\bar{\Lambda }$ hyperons in polarized proton-proton collisions at $\sqrt{s}$ = 200 GeV
• The Spin Alignment of Vector Mesons in High Energy pp Collisions
• Several Topics on Transverse Momentum-Dependent Fragmentation Functions
• Probing the longitudinal spin transfer via dihadron polarization correlations in unpolarized $e^{+}{e}^{-}$ and $pp$ collisions
• Longitudinal polarization of hyperon and anti-hyperon in semi-inclusive deep-inelastic scattering
• Polarized Lambda hyperon production in Semi-inclusive deep inelastic scattering off an unpolarized nulceon target
• Quark to $\Lambda$-hyperon spin transfers in the current-fragmentation region
• Anti-Hyperon polarization in high energy pp collisions with polarized beams
• Study of Σ(1385) and Ξ(1321) hyperon and antihyperon production in deep inelastic muon scattering
• Measuring polarization of light quarks at ATLAS and CMS
• Longitudinal and transverse spin transfer to $\Lambda$ and $\overline{\Lambda }$ hyperons in polarized $p$+$p$ collisions at $\sqrt{s}=200$ GeV
• Dihadron helicity correlation in photon-nucleus collisions
• Strange quark-antiquark asymmetry of nucleon sea from $\Lambda /\bar{\Lambda }$ polarization
• Spin Content of Lambda in QCD Sum Rules
• Suppression of Spin Transfer to $\Lambda$ Hyperon in Deep-Inelastic Scattering
• Longitudinal Spin Transfer to $\Lambda$ Hyperons in CLAS12
• Longitudinal spin transfer of Lambda and anti-Lambda in polarized pp collisions at \sqrt s=200 GeV at STAR
• Longitudinal Spin Transfer to $\Lambda$ Hyperons in Semi-Inclusive Deep Inelastic Scattering with CLAS12