David W. Meer

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— After 2001 the upgraded ep collider HERA will provide an about five times higher luminosity for the two experiments H1 and ZEUS. In order to cope with the expected higher event rates the H1 collaboration is building a track based trigger system, the Fast Track Trigger (FTT). It will be integrated in the first three levels (L1–L3) of the H1 trigger scheme(More)
Deep-inelastic ep scattering data taken with the H1 detector at HERA and corresponding to an integrated luminosity of 106 pb −1 are used to study the differential distributions of event shape variables. These include thrust, jet broadening, jet mass and the C-parameter. The four-momentum transfer Q is taken to be the relevant energy scale and ranges between(More)
This paper examines the stability of the exible-object impedance c ontroller when coupled to an arbitrary passive environment. A simple representative system is developed to study the problem based on phenomena observed in a more c omplex, experimental system. Analysis of this representative system leads to several conclusions regarding factors that limit(More)
— The electron-proton collider HERA is being upgraded to provide higher luminosity from the end of the year 2001. In order to enhance the selectivity on exclusive processes a Fast Track Trigger (FTT) with high momentum resolution is being built for the H1 Collaboration. The FTT will perform a 3-dimensional reconstruction of curved tracks in a magnetic field(More)
Dijet production in deep inelastic ep scattering is investigated in the region of low values of the Bjorken-variable x (10 −4 < x < 10 −2) and low photon virtualities Q 2 (5 < Q 2 < 100 GeV 2). The measured dijet cross sections are compared with perturbative QCD calculations in next-to-leading order. For most dijet variables studied, these calculations can(More)
Data taken with positrons of different longitudinal polarisation states in collision with un-polarised protons at HERA are used to measure the total cross sections of the charged current process, e + p → νX, for negative four-momentum transfer squared Q 2 > 400 GeV 2 and inelasticity y < 0.9. Together with the corresponding cross section obtained from the(More)
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