The production of the neutral strange hadrons K^0_S, Λ and antiΛ 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, Λ (antiΛ) asymmetry and polarization have been measured in three kinematic regions: Q^2 > 25 GeV2; 5 < Q^2 < 25 GeV2; and in photoproduction (Q^2≃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.
Measurement of K^0_s, Lambda, Antilambda production at HERA
MONACO, Vincenzo;SACCHI, Roberto;SOLANO, Ada Maria;
2007-01-01
Abstract
The production of the neutral strange hadrons K^0_S, Λ and antiΛ 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, Λ (antiΛ) asymmetry and polarization have been measured in three kinematic regions: Q^2 > 25 GeV2; 5 < Q^2 < 25 GeV2; and in photoproduction (Q^2≃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.File | Dimensione | Formato | |
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