Measurement of K0S, Λ and [anti-]Λ production at HERA

S. Chekanov, P. Kooijman

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Abstract

The production of the neutral strange hadrons $K^{0}_{S}$, $\Lambda$ 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.
Original languageUndefined/Unknown
Pages (from-to)1-13
Number of pages23
JournalEuropean physical journal. C, particles and fields
Volume51
Issue number1
Publication statusPublished - 2007

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