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تعداد نتایج: 244 فیلتر نتایج به سال:
Beauty photoproduction in dijet events has been measured at HERA with the ZEUS detector using an integrated luminosity of 126 pb. Beauty was identified in events with a muon in the final state by using the transverse momentum of the muon relative to the closest jet. Lifetime information from the silicon vertex detector was also used; the impact parameter of the muon with respect to the primary ...
Inclusive photoproduction of D in ep collisions at HERA has been measured with the ZEUS detector for photon-proton centre of mass energies in the range 115 < W < 280GeV and photon virtuality Q < 4GeV. The cross section σep→D∗X integrated over the kinematic region p D ⊥ > 3GeV and −1.5 < ηD∗ < 1.0 is (10.6 ± 1.7(stat .) ± 1.3 (syst .)) nb. Differential cross sections as functions of p ∗ ⊥ , η ∗ ...
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...
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...
The beauty production cross section for deep inelastic scattering events with at least one hard jet in the Breit frame together with a muon has been measured, for photon virtualities Q > 2 GeV, with the ZEUS detector at HERA using integrated luminosity of 72 pb. The total visible cross section is σbb(ep → e jet μ X) = 40.9 ± 5.7 (stat.) −4.4(syst.) pb. The next-to-leading order QCD prediction l...
The dijet cross section in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb. The events were required to have a virtuality of the incoming photon, Q, of less than 1 GeV and a photon-proton centre-of-mass energy in the range 134 < Wγp < 277 GeV. Each event contains at least two jets satisfying transverse-energy requirements of E T > 14 Ge...
First measurements of cross sections for isolated prompt photon production in deep inelastic ep scattering have been made using the ZEUS detector at the HERA electron-proton collider using an integrated luminosity of 121 pb. A signal for isolated photons in the transverse energy and rapidity ranges 5 < E T < 10GeV and −0.7 < η < 0.9 was observed for virtualities of the exchanged photon of Q > 3...
The production of D and D mesons has been measured with the ZEUS detector at HERA using an integrated luminosity of 133.6 pb. The measurements cover the kinematic range 5 < Q < 1000 GeV, 0.02 < y < 0.7, 1.5 < pT < 15 GeV and |ηD| < 1.6. Combinatorial background to the D meson signals is reduced by using the ZEUS microvertex detector to reconstruct displaced secondary vertices. Production cross ...
Next-to-leading-order QCD analyses of the ZEUS data on deep inelastic scattering together with fixed-target data have been performed, from which the gluon and quark densities of the proton and the value of the strong coupling constant, αs(MZ), were extracted. The study includes a full treatment of the experimental systematic uncertainties including point-to-point correlations. The resulting unc...
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|...
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