Measurement of K0S, Lambda, Antilambda production at HERA

Abstract

The production of the neutral strange hadrons $K_S^0$, $\Lambda$ and $\bar{\Lambda }$ has been measured in $ep$ collisions at HERA using the ZEUS detector. Cross sections, baryon-to-meson ratios, relative yields of strange and charged light hadrons, $\Lambda$ ($\bar{\Lambda }$) asymmetry and polarization have been measured in three kinematic regions: $Q^2 > 25 \gev^2$; $5 < Q^2 < 25 \gev^2$; and in photoproduction ($Q^2\simeq 0$). In photoproduction the presence of two hadronic jets, each with at least $5 \gev$ transverse energy, was required. The measurements agree in general with Monte Carlo models and are consistent with measurements made at $e^{+}{e}^{-}$ colliders, except for an enhancement of baryon relative to meson production in photoproduction.

40 pages, 20 figures, 1 table, minor revisions, accepted by European Physical Journal C

References in corpus (1)

• Identified hadron spectra at large transverse momentum in p+p and d+Au collisions at \sqrts_NN = 200 GeV

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• Suppression of Spin Transfer to $\Lambda$ Hyperon in Deep-Inelastic Scattering
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• Production of Lambda, Cascade and Omega Hyperons in ppbar Collisions at1.96 TeV Center of Mass Energy
• Structure Functions
• Global $\Lambda$ hyperon polarization in low-energy heavy ion collisions -- a scenario without vorticity