Characteristics of the hadronic final state of diffractive deep inelastic scattering events, ep → eXp, were studied in the kinematic range 4 < MX < 35 GeV, 4 < Q < 150 GeV, 70 < W < 250 GeV and 0.0003 < xIP < 0.03 with the ZEUS detector at HERA using an integrated luminosity of 13.8 pb. The events were tagged by identifying the diffractively scattered proton using the leading proton spectromete...

Inclusive jet differential cross sections have been measured in neutral current deep inelastic ep scattering for boson virtualities Q > 125 GeV. The data were taken using the ZEUS detector at HERA and correspond to an integrated luminosity of 38.6 pb. Jets were identified in the Breit frame using the longitudinally invariant kT cluster algorithm. Measurements of differential inclusive jet cross...

The exclusive photoproduction reaction γ p → Υ p has been studied with the ZEUS experiment in ep collisions at HERA using an integrated luminosity of 468 pb. The measurement covers the kinematic range 60 < W < 220 GeV and Q < 1 GeV, where W is the photon-proton centre-of-mass energy and Q is the photon virtuality. These results, which represent the analysis of the full ZEUS data sample for this...

The distribution of the azimuthal angle of charged and neutral hadrons relative to the lepton plane has been studied for neutral current deep inelastic ep scattering using an integrated luminosity of 45 pb taken with the ZEUS detector at HERA. The measurements were made in the hadronic centre-of-mass system. The analysis exploits the energy-flow method, which allows the measurement to be made o...

The cross sections for inelastic photoproduction of J/ψ and ψ mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 38.0 pb. The events were required to have 0.1 < z < 0.9 and 50 < W < 180 GeV, where z is the fraction of the incident photon energy carried by the J/ψ in the proton rest frame and W is the photon-proton centreof-mass energy. T...

Exclusive electroproduction of φ mesons has been studied in ep collisions at √ s = 318GeV with the ZEUS detector at HERA using an integrated luminosity of 65.1 pb. The γp cross section is presented in the kinematic range 2 < Q < 70GeV, 35 < W < 145GeV and |t| < 0.6GeV. The cross sections as functions of Q, W , t and helicity angle θh are compared to cross sections for other vector mesons. The r...

The photoproduction of beauty quarks in events with two jets and a muon has been measured with the ZEUS detector at HERA using an integrated luminosity of 110 pb. The fraction of jets containing b quarks was extracted from the transverse momentum distribution of the muon relative to the closest jet. Differential cross sections for beauty production as a function of the transverse momentum and p...

The production of beauty quarks with a D and a muon in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb. Low transverse-momentum thresholds for the muon and D meson allow a measurement of beauty production closer to the production threshold than previous measurements. The beauty signal was extracted using the charge correlations and angul...

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 ∗ ...

Beauty production in events containing two muons in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb. A low transverse-momentum threshold for muon identification, in combination with the large rapidity coverage of the ZEUS muon system, gives access to almost the full phase space for beauty production. The total cross section for beauty pr...