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Mean values and differential distributions of event-shape variables have been studied in neutral current deep inelastic scattering using an integrated luminosity of 82.2 pb collected with the ZEUS detector at HERA. The kinematic range was 80 < Q < 20 480GeV and 0.0024 < x < 0.6, where Q is the virtuality of the exchanged boson and x is the Bjorken variable. The data are compared with a model ba...
A search for narrow-width resonances that decay into electron+jet or neutrino+jet has been performed with the ZEUS detector at HERA operating at center-of-mass energies of 300 and 318 GeV. An integrated ep luminosity of 114.8 pb and ep luminosity of 16.7 pb were used. No evidence for any resonance was found. Limits were derived on the Yukawa coupling, λ, as a function of the mass of a hypotheti...
Three-jet production in deep inelastic ep scattering and photoproduction was investigated with the ZEUS detector at HERA using an integrated luminosity of 127 pb−1. Measurements of differential cross sections are presented as functions of angular correlations between the three jets in the final state and the protonbeam direction. These correlations provide a stringent test of perturbative QCD a...
A small electromagnetic sampling calorimeter, installed in the ZEUS experiment in 1995, significantly enhanced the acceptance for very low x and low Q inelastic neutral current scattering, ep → eX, at HERA. A measurement of the proton structure function F2 and the total virtual photon-proton (γ p) cross-section is presented for 0.11 ≤ Q ≤ 0.65 GeV and 2× 10 ≤ x ≤ 6× 10, corresponding to a range...
Dijet angular distributions of photoproduction events in which a D meson is produced in association with one of two energetic jets have been measured with the ZEUS detector at HERA, using an integrated luminosity of 120 pb. Differential cross sections as a function of the angle between the charm-jet and the proton-beam direction in the dijet rest frame have been measured for samples enriched in...
The production of dijets in diffractive deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 61 pb. The dijet cross section has been measured for virtualities of the exchanged virtual photon, 5 < Q < 100GeV, and γp centre-of-mass energies, 100 < W < 250 GeV. The jets, identified using the inclusive kT algorithm in the γ p frame, were requi...
Diffractive photoproduction of D(2010) mesons was measured with the ZEUS detector at the ep collider HERA, using an integrated luminosity of 78.6 pb. The D mesons were reconstructed in the kinematic range: transverse momentum pT (D ) > 1.9GeV and pseudorapidity |η(D∗)| < 1.6, using the decay D → Dπ s followed by D → Kπ (+c.c.). Diffractive events were identified by a large gap in pseudorapidity...
Arthritis Rheum 1984;27:361–8. 12. Altman R, Asch E, Bloch D, Bole G, Borenstein D, Brandt K, et al. The American College of Rheumatology criteria for the classification and reporting of osteoarthritis of the knee. Arthritis Rheum 1986;29:1039–49. 13. Altman R, Alarcon G, Appelrouth D, Bloch D, Borenstein D, Brandt K, et al. The American College of Rheumatology criteria for the classification a...
The charm fragmentation function has been measured in D photoproduction with the ZEUS detector at HERA using an integrated luminosity of 120 pb. The fragmentation function is measured versus z = (E + p‖) D∗/2Ejet, where E is the energy of the D meson and p‖ is the longitudinal momentum of the D meson relative to the axis of the associated jet of energy E. Jets were reconstructed using the kT cl...
In a search for signatures of physics processes beyond the Standard Model, various eeqq vector contact–interaction hypotheses have been tested using the high–Q, deep inelastic neutral–current ep scattering data collected with the ZEUS detector at HERA. The data correspond to an integrated luminosity of 47.7 pb of ep interactions at 300GeV center–of–mass energy. No significant evidence of a cont...
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