Measurement of K0s, Lambda, anti-Lambda production with ZEUS at HERA 

Production of the neutral strange hadrons K0s, Lambda and anti-Lambda was 
measured with ZEUS at HERA using an integrated luminosity of 121 pb-1. 
Cross sections, baryon-to-meson ratios, relative yields of strange and 
charged light hadrons, Lambda (anti-Lambda) asymmetry and polarization 
were determined in three kinematic regions: Q2 > 25 GeV2; 5 < Q2 < 25 GeV2, 
and in photoproduction (Q2 ~ 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.