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تعداد نتایج: 244 فیلتر نتایج به سال:
/ 96 08 01 0 v 1 1 5 A ug 1 99 6 DESY 96 - 159 Measurement of Elastic ω Photoproduction at HERA ZEUS
The reaction γp → ωp (ω → π+π−π0 and π0 → γγ) has been studied in ep interactions using the ZEUS detector at photon-proton centre-of-mass energies between 70 and 90GeV and |t| < 0.6GeV, where t is the squared four momentum transferred at the proton vertex. The elastic ω photoproduction cross section has been measured to be σγp→ωp = 1.21 ± 0.12 ± 0.23μb. The differential cross section dσγp→ωp/d|...
Dijet production has been studied in neutral current deep inelastic ep scattering for 470 < Q < 20000 GeV with the ZEUS detector at HERA using an integrated luminosity of 38.4 pb. Dijet differential cross sections are presented in a kinematic region where both theoretical and experimental uncertainties are small. Next-to-leading-order (NLO) QCD calculations describe the measured differential cr...
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 is 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 bas...
A search for single-top production, ep → etX, has been made with the ZEUS detector at HERA using an integrated luminosity of 130.1 pb. Events from both the leptonic and hadronic decay channels of the W boson resulting from the decay of the top quark were sought. For the leptonic mode, the search was made for events with isolated high-energy leptons and significant missing transverse momentum. F...
Exclusive production of ρ0 and J/ψ mesons in e+p collisions has been studied with the ZEUS detector in the kinematic range 0.25 < Q2 < 50 GeV, 20 < W < 167 GeV for the ρ0 data and 2 < Q2 < 40 GeV, 50 < W < 150 GeV for the J/ψ data. Cross sections for exclusive ρ0 and J/ψ production have been measured as a function of Q2, W and t. The spin-density matrix elements r04 00, r 1 1−1 and Re r 5 10 ha...
Cross sections for ep charged current deep inelastic scattering have been measured at a centre-of-mass energy of 318GeV with an integrated luminosity of 16.4 pb using the ZEUS detector at HERA. Differential cross-sections dσ/dQ, dσ/dx and dσ/dy are presented for Q > 200GeV. In addition, dσ/dxdQ was measured in the kinematic range 280GeV < Q < 30 000GeV and 0.015 < x < 0.42. The predictions of t...
Searches in ep collisions for heavy excited fermions have been performed with the ZEUS detector at HERA. Excited states of electrons and quarks have been searched for in ep collisions at a centre-of-mass energy of 300GeV using an integrated luminosity of 47.7 pb. Excited electrons have been sought via the decays e → eγ, e → eZ and e → νW . Excited quarks have been sought via the decays q → qγ a...
Bose-Einstein correlations in one and two dimensions have been studied in deep inelastic ep scattering events measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb. The correlations are independent of the virtuality of the exchanged photon, Q, in the range 0.1 < Q < 8000GeV. There is no significant difference between the correlations in the current and target regions ...
This article demonstrates Gamson’s claim that behind the apparent agreement implied by ‘‘consensus frames’’ lies considerable dissensus. Ironically, the very potency of consensus frames may generate contested claims to the ownership of a social problem. Food security is a potent consensus frame that has generated at least three distinct collective action frames: food security as hunger; food se...
Dijet production has been studied in neutral current deep inelastic ep scattering for 470 < Q < 20000 GeV with the ZEUS detector at HERA using an integrated luminosity of 38.4 pb. Dijet differential cross sections are presented in a kinematic region where both theoretical and experimental uncertainties are small. Next-to-leading-order (NLO) QCD calculations describe the measured differential cr...
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