Strangeness Production in Deep-Inelastic Positron-Proton Scattering at HERA

Abstract

Measurements are presented of $K^0$ meson and $\Lambda$ baryon production in deep-inelastic positron-proton scattering (DIS) in the kinematic range $10<Q^2<70$GeV${}^2$ and $10^{-4}<x<10^{-2}$. The measurements, obtained using the H1 detector at the HERA collider, are discussed in the light of possible mechanisms for increased strangeness production at low Bjorken-$x$. Comparisons of the $x_F$ spectra, where $x_F$ is the fractional longitudinal momentum in the hadronic centre-of-mass frame, with results from electron-positron annihilation are made. The $x_F$ spectra and the $K^0$ ``seagull'' plot are compared with previous DIS results. The mean $K^0$ and $\Lambda$ multiplicities are studied as a function of the centre-of-mass energy $W$ and are observed to be consistent with a logarithmic increase with $W$ when compared with previous measurements. A comparison of the levels of strangeness production in diffractive and non-diffractive DIS is made. An upper limit of $0.9$nb, at the 95% confidence level, is placed on the cross-section for QCD instanton induced events.

36 pages, latex, 15 Figures

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• QCDINS 2.0 - A Monte Carlo generator for instanton-induced processes in deep-inelastic scattering
• Measurement of Inclusive Ds+- Photoproduction at HERA
• A Study of Strange Particle Production in Muon Neutrino Charged Current Interactions in the NOMAD Experiment
• Measurement of K0S, Lambda, Antilambda production at HERA
• Search for a Narrow Baryonic Resonance Decaying to $K_s^{0}p$ or $K_s^0\bar{p}$ in Deep Inelastic Scattering at HERA
• Transverse polarization of the $\Lambda$ hyperon from unpolarized quark fragmentation in the diquark model
• The decay width of stringy hadrons
• Search for Baryonic Resonances Decaying to Xi pi in Deep-Inelastic Scattering at HERA
• Observation of the strange sea in the proton via inclusive Phi-meson production in neutral current deep inelastic scattering at HERA
• Observation of KsKs resonances in deep inelastic scattering at HERA
• Global analysis of fragmentation functions to light neutral hadrons
• Strangeness Production at low Q^2 in Deep-Inelastic ep Scattering at HERA
• Bounds on QCD Instantons from HERA
• Measurement of $K_S^0$ and ${\Lambda }^0$ production in $t\bar{t}$ dileptonic events in $pp$ collisions at $\sqrt{s}=$ 7 TeV with the ATLAS detector
• Production of kshort, kstar(892)and phi(1020) in minimum bias events and kshort and lambda in jets in pbar p collisions at sqrt(s)=1.96 TeV
• Deep Inelastic Scattering at HERA
• QCD-Instantons at HERA -- An Introduction
• Searching for QCD-Instantons at HERA
• A Search for Instantons at HERA
• Vector meson production and inclusive KsKs final state at HERA